diff --git a/controller/errdefs/build.go b/controller/errdefs/build.go
index 471adbac..d289d574 100644
--- a/controller/errdefs/build.go
+++ b/controller/errdefs/build.go
@@ -26,21 +26,21 @@ func (e *BuildError) ToProto() grpcerrors.TypedErrorProto {
 }
 
 func (e *BuildError) PrintBuildDetails(w io.Writer) error {
-	if e.BuildRef == "" {
+	if e.Ref == "" {
 		return nil
 	}
 	ebr := &desktop.ErrorWithBuildRef{
-		Ref: e.BuildRef,
+		Ref: e.Ref,
 		Err: e.error,
 	}
 	return ebr.Print(w)
 }
 
-func WrapBuild(err error, ref string, buildRef string) error {
+func WrapBuild(err error, sessionID string, ref string) error {
 	if err == nil {
 		return nil
 	}
-	return &BuildError{Build: &Build{Ref: ref, BuildRef: buildRef}, error: err}
+	return &BuildError{Build: &Build{SessionID: sessionID, Ref: ref}, error: err}
 }
 
 func (b *Build) WrapError(err error) error {
diff --git a/controller/errdefs/errdefs.pb.go b/controller/errdefs/errdefs.pb.go
index 40505a99..e6daad70 100644
--- a/controller/errdefs/errdefs.pb.go
+++ b/controller/errdefs/errdefs.pb.go
@@ -25,8 +25,8 @@ type Build struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref      string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
-	BuildRef string `protobuf:"bytes,2,opt,name=BuildRef,proto3" json:"BuildRef,omitempty"`
+	SessionID string `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
+	Ref       string `protobuf:"bytes,2,opt,name=Ref,proto3" json:"Ref,omitempty"`
 }
 
 func (x *Build) Reset() {
@@ -61,16 +61,16 @@ func (*Build) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_errdefs_errdefs_proto_rawDescGZIP(), []int{0}
 }
 
-func (x *Build) GetRef() string {
+func (x *Build) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
 
-func (x *Build) GetBuildRef() string {
+func (x *Build) GetRef() string {
 	if x != nil {
-		return x.BuildRef
+		return x.Ref
 	}
 	return ""
 }
@@ -83,13 +83,14 @@ var file_github_com_docker_buildx_controller_errdefs_errdefs_proto_rawDesc = []b
 	0x6f, 0x6c, 0x6c, 0x65, 0x72, 0x2f, 0x65, 0x72, 0x72, 0x64, 0x65, 0x66, 0x73, 0x2f, 0x65, 0x72,
 	0x72, 0x64, 0x65, 0x66, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x15, 0x64, 0x6f, 0x63,
 	0x6b, 0x65, 0x72, 0x2e, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x78, 0x2e, 0x65, 0x72, 0x72, 0x64, 0x65,
-	0x66, 0x73, 0x22, 0x35, 0x0a, 0x05, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x12, 0x10, 0x0a, 0x03, 0x52,
-	0x65, 0x66, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x52, 0x65, 0x66, 0x12, 0x1a, 0x0a,
-	0x08, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x52, 0x65, 0x66, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52,
-	0x08, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x52, 0x65, 0x66, 0x42, 0x2d, 0x5a, 0x2b, 0x67, 0x69, 0x74,
-	0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x64, 0x6f, 0x63, 0x6b, 0x65, 0x72, 0x2f, 0x62,
-	0x75, 0x69, 0x6c, 0x64, 0x78, 0x2f, 0x63, 0x6f, 0x6e, 0x74, 0x72, 0x6f, 0x6c, 0x6c, 0x65, 0x72,
-	0x2f, 0x65, 0x72, 0x72, 0x64, 0x65, 0x66, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x66, 0x73, 0x22, 0x37, 0x0a, 0x05, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x12, 0x1c, 0x0a, 0x09, 0x53,
+	0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x49, 0x44, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x09,
+	0x53, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x49, 0x44, 0x12, 0x10, 0x0a, 0x03, 0x52, 0x65, 0x66,
+	0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x52, 0x65, 0x66, 0x42, 0x2d, 0x5a, 0x2b, 0x67,
+	0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x64, 0x6f, 0x63, 0x6b, 0x65, 0x72,
+	0x2f, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x78, 0x2f, 0x63, 0x6f, 0x6e, 0x74, 0x72, 0x6f, 0x6c, 0x6c,
+	0x65, 0x72, 0x2f, 0x65, 0x72, 0x72, 0x64, 0x65, 0x66, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x33,
 }
 
 var (
diff --git a/controller/errdefs/errdefs.proto b/controller/errdefs/errdefs.proto
index ded837e9..a1b903f8 100644
--- a/controller/errdefs/errdefs.proto
+++ b/controller/errdefs/errdefs.proto
@@ -5,6 +5,6 @@ package docker.buildx.errdefs;
 option go_package = "github.com/docker/buildx/controller/errdefs";
 
 message Build {
-  string Ref = 1;
-  string BuildRef = 2;
+  string SessionID = 1;
+  string Ref = 2;
 }
diff --git a/controller/errdefs/errdefs_vtproto.pb.go b/controller/errdefs/errdefs_vtproto.pb.go
index cab6582e..c6fe19b5 100644
--- a/controller/errdefs/errdefs_vtproto.pb.go
+++ b/controller/errdefs/errdefs_vtproto.pb.go
@@ -24,8 +24,8 @@ func (m *Build) CloneVT() *Build {
 		return (*Build)(nil)
 	}
 	r := new(Build)
+	r.SessionID = m.SessionID
 	r.Ref = m.Ref
-	r.BuildRef = m.BuildRef
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
 		copy(r.unknownFields, m.unknownFields)
@@ -43,10 +43,10 @@ func (this *Build) EqualVT(that *Build) bool {
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
-	if this.BuildRef != that.BuildRef {
+	if this.Ref != that.Ref {
 		return false
 	}
 	return string(this.unknownFields) == string(that.unknownFields)
@@ -89,18 +89,18 @@ func (m *Build) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
-	if len(m.BuildRef) > 0 {
-		i -= len(m.BuildRef)
-		copy(dAtA[i:], m.BuildRef)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.BuildRef)))
-		i--
-		dAtA[i] = 0x12
-	}
 	if len(m.Ref) > 0 {
 		i -= len(m.Ref)
 		copy(dAtA[i:], m.Ref)
 		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
 		i--
+		dAtA[i] = 0x12
+	}
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
+		i--
 		dAtA[i] = 0xa
 	}
 	return len(dAtA) - i, nil
@@ -112,11 +112,11 @@ func (m *Build) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
-	l = len(m.BuildRef)
+	l = len(m.Ref)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -154,6 +154,38 @@ func (m *Build) UnmarshalVT(dAtA []byte) error {
 		}
 		switch fieldNum {
 		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return protohelpers.ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return protohelpers.ErrInvalidLength
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return protohelpers.ErrInvalidLength
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.SessionID = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 2:
 			if wireType != 2 {
 				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
 			}
@@ -185,38 +217,6 @@ func (m *Build) UnmarshalVT(dAtA []byte) error {
 			}
 			m.Ref = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
-		case 2:
-			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field BuildRef", wireType)
-			}
-			var stringLen uint64
-			for shift := uint(0); ; shift += 7 {
-				if shift >= 64 {
-					return protohelpers.ErrIntOverflow
-				}
-				if iNdEx >= l {
-					return io.ErrUnexpectedEOF
-				}
-				b := dAtA[iNdEx]
-				iNdEx++
-				stringLen |= uint64(b&0x7F) << shift
-				if b < 0x80 {
-					break
-				}
-			}
-			intStringLen := int(stringLen)
-			if intStringLen < 0 {
-				return protohelpers.ErrInvalidLength
-			}
-			postIndex := iNdEx + intStringLen
-			if postIndex < 0 {
-				return protohelpers.ErrInvalidLength
-			}
-			if postIndex > l {
-				return io.ErrUnexpectedEOF
-			}
-			m.BuildRef = string(dAtA[iNdEx:postIndex])
-			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := protohelpers.Skip(dAtA[iNdEx:])
diff --git a/controller/local/controller.go b/controller/local/controller.go
index 68c5a809..9d58b31f 100644
--- a/controller/local/controller.go
+++ b/controller/local/controller.go
@@ -22,7 +22,7 @@ import (
 func NewLocalBuildxController(ctx context.Context, dockerCli command.Cli, logger progress.SubLogger) control.BuildxController {
 	return &localController{
 		dockerCli: dockerCli,
-		ref:       "local",
+		sessionID: "local",
 		processes: processes.NewManager(),
 	}
 }
@@ -36,7 +36,7 @@ type buildConfig struct {
 
 type localController struct {
 	dockerCli   command.Cli
-	ref         string
+	sessionID   string
 	buildConfig buildConfig
 	processes   *processes.Manager
 
@@ -57,30 +57,30 @@ func (b *localController) Build(ctx context.Context, options *controllerapi.Buil
 			buildOptions: options,
 		}
 		if buildErr != nil {
-			var buildRef string
+			var ref string
 			var ebr *desktop.ErrorWithBuildRef
 			if errors.As(buildErr, &ebr) {
-				buildRef = ebr.Ref
+				ref = ebr.Ref
 			}
-			buildErr = controllererrors.WrapBuild(buildErr, b.ref, buildRef)
+			buildErr = controllererrors.WrapBuild(buildErr, b.sessionID, ref)
 		}
 	}
 	if buildErr != nil {
 		return "", nil, nil, buildErr
 	}
-	return b.ref, resp, dockerfileMappings, nil
+	return b.sessionID, resp, dockerfileMappings, nil
 }
 
-func (b *localController) ListProcesses(ctx context.Context, ref string) (infos []*controllerapi.ProcessInfo, retErr error) {
-	if ref != b.ref {
-		return nil, errors.Errorf("unknown ref %q", ref)
+func (b *localController) ListProcesses(ctx context.Context, sessionID string) (infos []*controllerapi.ProcessInfo, retErr error) {
+	if sessionID != b.sessionID {
+		return nil, errors.Errorf("unknown session ID %q", sessionID)
 	}
 	return b.processes.ListProcesses(), nil
 }
 
-func (b *localController) DisconnectProcess(ctx context.Context, ref, pid string) error {
-	if ref != b.ref {
-		return errors.Errorf("unknown ref %q", ref)
+func (b *localController) DisconnectProcess(ctx context.Context, sessionID, pid string) error {
+	if sessionID != b.sessionID {
+		return errors.Errorf("unknown session ID %q", sessionID)
 	}
 	return b.processes.DeleteProcess(pid)
 }
@@ -89,9 +89,9 @@ func (b *localController) cancelRunningProcesses() {
 	b.processes.CancelRunningProcesses()
 }
 
-func (b *localController) Invoke(ctx context.Context, ref string, pid string, cfg *controllerapi.InvokeConfig, ioIn io.ReadCloser, ioOut io.WriteCloser, ioErr io.WriteCloser) error {
-	if ref != b.ref {
-		return errors.Errorf("unknown ref %q", ref)
+func (b *localController) Invoke(ctx context.Context, sessionID string, pid string, cfg *controllerapi.InvokeConfig, ioIn io.ReadCloser, ioOut io.WriteCloser, ioErr io.WriteCloser) error {
+	if sessionID != b.sessionID {
+		return errors.Errorf("unknown session ID %q", sessionID)
 	}
 
 	proc, ok := b.processes.Get(pid)
@@ -136,7 +136,7 @@ func (b *localController) Close() error {
 }
 
 func (b *localController) List(ctx context.Context) (res []string, _ error) {
-	return []string{b.ref}, nil
+	return []string{b.sessionID}, nil
 }
 
 func (b *localController) Disconnect(ctx context.Context, key string) error {
@@ -144,9 +144,9 @@ func (b *localController) Disconnect(ctx context.Context, key string) error {
 	return nil
 }
 
-func (b *localController) Inspect(ctx context.Context, ref string) (*controllerapi.InspectResponse, error) {
-	if ref != b.ref {
-		return nil, errors.Errorf("unknown ref %q", ref)
+func (b *localController) Inspect(ctx context.Context, sessionID string) (*controllerapi.InspectResponse, error) {
+	if sessionID != b.sessionID {
+		return nil, errors.Errorf("unknown session ID %q", sessionID)
 	}
 	return &controllerapi.InspectResponse{Options: b.buildConfig.buildOptions}, nil
 }
diff --git a/controller/pb/controller.pb.go b/controller/pb/controller.pb.go
index 4526fc22..95913c07 100644
--- a/controller/pb/controller.pb.go
+++ b/controller/pb/controller.pb.go
@@ -27,7 +27,7 @@ type ListProcessesRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	SessionID string `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
 }
 
 func (x *ListProcessesRequest) Reset() {
@@ -62,9 +62,9 @@ func (*ListProcessesRequest) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_pb_controller_proto_rawDescGZIP(), []int{0}
 }
 
-func (x *ListProcessesRequest) GetRef() string {
+func (x *ListProcessesRequest) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
@@ -176,7 +176,7 @@ type DisconnectProcessRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref       string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	SessionID string `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
 	ProcessID string `protobuf:"bytes,2,opt,name=ProcessID,proto3" json:"ProcessID,omitempty"`
 }
 
@@ -212,9 +212,9 @@ func (*DisconnectProcessRequest) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_pb_controller_proto_rawDescGZIP(), []int{3}
 }
 
-func (x *DisconnectProcessRequest) GetRef() string {
+func (x *DisconnectProcessRequest) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
@@ -269,8 +269,8 @@ type BuildRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref     string        `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
-	Options *BuildOptions `protobuf:"bytes,2,opt,name=Options,proto3" json:"Options,omitempty"`
+	SessionID string        `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
+	Options   *BuildOptions `protobuf:"bytes,2,opt,name=Options,proto3" json:"Options,omitempty"`
 }
 
 func (x *BuildRequest) Reset() {
@@ -305,9 +305,9 @@ func (*BuildRequest) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_pb_controller_proto_rawDescGZIP(), []int{5}
 }
 
-func (x *BuildRequest) GetRef() string {
+func (x *BuildRequest) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
@@ -981,7 +981,7 @@ type InspectRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	SessionID string `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
 }
 
 func (x *InspectRequest) Reset() {
@@ -1016,9 +1016,9 @@ func (*InspectRequest) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_pb_controller_proto_rawDescGZIP(), []int{13}
 }
 
-func (x *InspectRequest) GetRef() string {
+func (x *InspectRequest) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
@@ -1232,7 +1232,7 @@ type DisconnectRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	SessionID string `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
 }
 
 func (x *DisconnectRequest) Reset() {
@@ -1267,9 +1267,9 @@ func (*DisconnectRequest) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_pb_controller_proto_rawDescGZIP(), []int{18}
 }
 
-func (x *DisconnectRequest) GetRef() string {
+func (x *DisconnectRequest) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
@@ -1317,7 +1317,7 @@ type ListRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	SessionID string `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
 }
 
 func (x *ListRequest) Reset() {
@@ -1352,9 +1352,9 @@ func (*ListRequest) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_pb_controller_proto_rawDescGZIP(), []int{20}
 }
 
-func (x *ListRequest) GetRef() string {
+func (x *ListRequest) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
@@ -1492,7 +1492,7 @@ type InputInitMessage struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	SessionID string `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
 }
 
 func (x *InputInitMessage) Reset() {
@@ -1527,9 +1527,9 @@ func (*InputInitMessage) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_pb_controller_proto_rawDescGZIP(), []int{23}
 }
 
-func (x *InputInitMessage) GetRef() string {
+func (x *InputInitMessage) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
@@ -1745,7 +1745,7 @@ type InitMessage struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	SessionID string `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
 	// If ProcessID already exists in the server, it tries to connect to it
 	// instead of invoking the new one. In this case, InvokeConfig will be ignored.
 	ProcessID    string        `protobuf:"bytes,2,opt,name=ProcessID,proto3" json:"ProcessID,omitempty"`
@@ -1784,9 +1784,9 @@ func (*InitMessage) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_pb_controller_proto_rawDescGZIP(), []int{27}
 }
 
-func (x *InitMessage) GetRef() string {
+func (x *InitMessage) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
@@ -2104,7 +2104,7 @@ type StatusRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Ref string `protobuf:"bytes,1,opt,name=Ref,proto3" json:"Ref,omitempty"`
+	SessionID string `protobuf:"bytes,1,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
 }
 
 func (x *StatusRequest) Reset() {
@@ -2139,9 +2139,9 @@ func (*StatusRequest) Descriptor() ([]byte, []int) {
 	return file_github_com_docker_buildx_controller_pb_controller_proto_rawDescGZIP(), []int{32}
 }
 
-func (x *StatusRequest) GetRef() string {
+func (x *StatusRequest) GetSessionID() string {
 	if x != nil {
-		return x.Ref
+		return x.SessionID
 	}
 	return ""
 }
@@ -2380,178 +2380,181 @@ var file_github_com_docker_buildx_controller_pb_controller_proto_rawDesc = []byt
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 }
 
 var (
diff --git a/controller/pb/controller.proto b/controller/pb/controller.proto
index 18044d3d..71281c1b 100644
--- a/controller/pb/controller.proto
+++ b/controller/pb/controller.proto
@@ -21,7 +21,7 @@ service Controller {
 }
 
 message ListProcessesRequest {
-  string Ref = 1;
+  string SessionID = 1;
 }
 
 message ListProcessesResponse {
@@ -34,7 +34,7 @@ message ProcessInfo {
 }
 
 message DisconnectProcessRequest {
-  string Ref = 1;
+  string SessionID = 1;
   string ProcessID = 2;
 }
 
@@ -42,7 +42,7 @@ message DisconnectProcessResponse {
 }
 
 message BuildRequest {
-  string Ref = 1;
+  string SessionID = 1;
   BuildOptions Options = 2;
 }
 
@@ -118,7 +118,7 @@ message CallFunc {
 }
 
 message InspectRequest {
-  string Ref = 1;
+  string SessionID = 1;
 }
 
 message InspectResponse {
@@ -140,13 +140,13 @@ message BuildResponse {
 }
 
 message DisconnectRequest {
-  string Ref = 1;
+  string SessionID = 1;
 }
 
 message DisconnectResponse {}
 
 message ListRequest {
-  string Ref = 1;
+  string SessionID = 1;
 }
 
 message ListResponse {
@@ -161,7 +161,7 @@ message InputMessage {
 }
 
 message InputInitMessage {
-  string Ref = 1;
+  string SessionID = 1;
 }
 
 message DataMessage {
@@ -186,7 +186,7 @@ message Message {
 }
 
 message InitMessage {
-  string Ref = 1;
+  string SessionID = 1;
 
   // If ProcessID already exists in the server, it tries to connect to it
   // instead of invoking the new one. In this case, InvokeConfig will be ignored.
@@ -227,7 +227,7 @@ message SignalMessage {
 }
 
 message StatusRequest {
-  string Ref = 1;
+  string SessionID = 1;
 }
 
 message StatusResponse {
diff --git a/controller/pb/controller_vtproto.pb.go b/controller/pb/controller_vtproto.pb.go
index 572672a0..5785602e 100644
--- a/controller/pb/controller_vtproto.pb.go
+++ b/controller/pb/controller_vtproto.pb.go
@@ -26,7 +26,7 @@ func (m *ListProcessesRequest) CloneVT() *ListProcessesRequest {
 		return (*ListProcessesRequest)(nil)
 	}
 	r := new(ListProcessesRequest)
-	r.Ref = m.Ref
+	r.SessionID = m.SessionID
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
 		copy(r.unknownFields, m.unknownFields)
@@ -84,7 +84,7 @@ func (m *DisconnectProcessRequest) CloneVT() *DisconnectProcessRequest {
 		return (*DisconnectProcessRequest)(nil)
 	}
 	r := new(DisconnectProcessRequest)
-	r.Ref = m.Ref
+	r.SessionID = m.SessionID
 	r.ProcessID = m.ProcessID
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
@@ -118,7 +118,7 @@ func (m *BuildRequest) CloneVT() *BuildRequest {
 		return (*BuildRequest)(nil)
 	}
 	r := new(BuildRequest)
-	r.Ref = m.Ref
+	r.SessionID = m.SessionID
 	r.Options = m.Options.CloneVT()
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
@@ -396,7 +396,7 @@ func (m *InspectRequest) CloneVT() *InspectRequest {
 		return (*InspectRequest)(nil)
 	}
 	r := new(InspectRequest)
-	r.Ref = m.Ref
+	r.SessionID = m.SessionID
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
 		copy(r.unknownFields, m.unknownFields)
@@ -495,7 +495,7 @@ func (m *DisconnectRequest) CloneVT() *DisconnectRequest {
 		return (*DisconnectRequest)(nil)
 	}
 	r := new(DisconnectRequest)
-	r.Ref = m.Ref
+	r.SessionID = m.SessionID
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
 		copy(r.unknownFields, m.unknownFields)
@@ -528,7 +528,7 @@ func (m *ListRequest) CloneVT() *ListRequest {
 		return (*ListRequest)(nil)
 	}
 	r := new(ListRequest)
-	r.Ref = m.Ref
+	r.SessionID = m.SessionID
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
 		copy(r.unknownFields, m.unknownFields)
@@ -603,7 +603,7 @@ func (m *InputInitMessage) CloneVT() *InputInitMessage {
 		return (*InputInitMessage)(nil)
 	}
 	r := new(InputInitMessage)
-	r.Ref = m.Ref
+	r.SessionID = m.SessionID
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
 		copy(r.unknownFields, m.unknownFields)
@@ -713,7 +713,7 @@ func (m *InitMessage) CloneVT() *InitMessage {
 		return (*InitMessage)(nil)
 	}
 	r := new(InitMessage)
-	r.Ref = m.Ref
+	r.SessionID = m.SessionID
 	r.ProcessID = m.ProcessID
 	r.InvokeConfig = m.InvokeConfig.CloneVT()
 	if len(m.unknownFields) > 0 {
@@ -829,7 +829,7 @@ func (m *StatusRequest) CloneVT() *StatusRequest {
 		return (*StatusRequest)(nil)
 	}
 	r := new(StatusRequest)
-	r.Ref = m.Ref
+	r.SessionID = m.SessionID
 	if len(m.unknownFields) > 0 {
 		r.unknownFields = make([]byte, len(m.unknownFields))
 		copy(r.unknownFields, m.unknownFields)
@@ -959,7 +959,7 @@ func (this *ListProcessesRequest) EqualVT(that *ListProcessesRequest) bool {
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
 	return string(this.unknownFields) == string(that.unknownFields)
@@ -1033,7 +1033,7 @@ func (this *DisconnectProcessRequest) EqualVT(that *DisconnectProcessRequest) bo
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
 	if this.ProcessID != that.ProcessID {
@@ -1071,7 +1071,7 @@ func (this *BuildRequest) EqualVT(that *BuildRequest) bool {
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
 	if !this.Options.EqualVT(that.Options) {
@@ -1524,7 +1524,7 @@ func (this *InspectRequest) EqualVT(that *InspectRequest) bool {
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
 	return string(this.unknownFields) == string(that.unknownFields)
@@ -1651,7 +1651,7 @@ func (this *DisconnectRequest) EqualVT(that *DisconnectRequest) bool {
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
 	return string(this.unknownFields) == string(that.unknownFields)
@@ -1686,7 +1686,7 @@ func (this *ListRequest) EqualVT(that *ListRequest) bool {
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
 	return string(this.unknownFields) == string(that.unknownFields)
@@ -1808,7 +1808,7 @@ func (this *InputInitMessage) EqualVT(that *InputInitMessage) bool {
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
 	return string(this.unknownFields) == string(that.unknownFields)
@@ -1991,7 +1991,7 @@ func (this *InitMessage) EqualVT(that *InitMessage) bool {
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
 	if this.ProcessID != that.ProcessID {
@@ -2149,7 +2149,7 @@ func (this *StatusRequest) EqualVT(that *StatusRequest) bool {
 	} else if this == nil || that == nil {
 		return false
 	}
-	if this.Ref != that.Ref {
+	if this.SessionID != that.SessionID {
 		return false
 	}
 	return string(this.unknownFields) == string(that.unknownFields)
@@ -2356,10 +2356,10 @@ func (m *ListProcessesRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error)
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
-	if len(m.Ref) > 0 {
-		i -= len(m.Ref)
-		copy(dAtA[i:], m.Ref)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
 		i--
 		dAtA[i] = 0xa
 	}
@@ -2498,10 +2498,10 @@ func (m *DisconnectProcessRequest) MarshalToSizedBufferVT(dAtA []byte) (int, err
 		i--
 		dAtA[i] = 0x12
 	}
-	if len(m.Ref) > 0 {
-		i -= len(m.Ref)
-		copy(dAtA[i:], m.Ref)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
 		i--
 		dAtA[i] = 0xa
 	}
@@ -2581,10 +2581,10 @@ func (m *BuildRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i--
 		dAtA[i] = 0x12
 	}
-	if len(m.Ref) > 0 {
-		i -= len(m.Ref)
-		copy(dAtA[i:], m.Ref)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
 		i--
 		dAtA[i] = 0xa
 	}
@@ -3363,10 +3363,10 @@ func (m *InspectRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
-	if len(m.Ref) > 0 {
-		i -= len(m.Ref)
-		copy(dAtA[i:], m.Ref)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
 		i--
 		dAtA[i] = 0xa
 	}
@@ -3603,10 +3603,10 @@ func (m *DisconnectRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
-	if len(m.Ref) > 0 {
-		i -= len(m.Ref)
-		copy(dAtA[i:], m.Ref)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
 		i--
 		dAtA[i] = 0xa
 	}
@@ -3676,10 +3676,10 @@ func (m *ListRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
-	if len(m.Ref) > 0 {
-		i -= len(m.Ref)
-		copy(dAtA[i:], m.Ref)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
 		i--
 		dAtA[i] = 0xa
 	}
@@ -3846,10 +3846,10 @@ func (m *InputInitMessage) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
-	if len(m.Ref) > 0 {
-		i -= len(m.Ref)
-		copy(dAtA[i:], m.Ref)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
 		i--
 		dAtA[i] = 0xa
 	}
@@ -4120,10 +4120,10 @@ func (m *InitMessage) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i--
 		dAtA[i] = 0x12
 	}
-	if len(m.Ref) > 0 {
-		i -= len(m.Ref)
-		copy(dAtA[i:], m.Ref)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
 		i--
 		dAtA[i] = 0xa
 	}
@@ -4432,10 +4432,10 @@ func (m *StatusRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
-	if len(m.Ref) > 0 {
-		i -= len(m.Ref)
-		copy(dAtA[i:], m.Ref)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Ref)))
+	if len(m.SessionID) > 0 {
+		i -= len(m.SessionID)
+		copy(dAtA[i:], m.SessionID)
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.SessionID)))
 		i--
 		dAtA[i] = 0xa
 	}
@@ -4707,7 +4707,7 @@ func (m *ListProcessesRequest) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -4755,7 +4755,7 @@ func (m *DisconnectProcessRequest) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -4783,7 +4783,7 @@ func (m *BuildRequest) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -5108,7 +5108,7 @@ func (m *InspectRequest) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -5197,7 +5197,7 @@ func (m *DisconnectRequest) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -5221,7 +5221,7 @@ func (m *ListRequest) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -5292,7 +5292,7 @@ func (m *InputInitMessage) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -5402,7 +5402,7 @@ func (m *InitMessage) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -5528,7 +5528,7 @@ func (m *StatusRequest) SizeVT() (n int) {
 	}
 	var l int
 	_ = l
-	l = len(m.Ref)
+	l = len(m.SessionID)
 	if l > 0 {
 		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
 	}
@@ -5671,7 +5671,7 @@ func (m *ListProcessesRequest) UnmarshalVT(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -5699,7 +5699,7 @@ func (m *ListProcessesRequest) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Ref = string(dAtA[iNdEx:postIndex])
+			m.SessionID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
@@ -5958,7 +5958,7 @@ func (m *DisconnectProcessRequest) UnmarshalVT(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -5986,7 +5986,7 @@ func (m *DisconnectProcessRequest) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Ref = string(dAtA[iNdEx:postIndex])
+			m.SessionID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		case 2:
 			if wireType != 2 {
@@ -6124,7 +6124,7 @@ func (m *BuildRequest) UnmarshalVT(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -6152,7 +6152,7 @@ func (m *BuildRequest) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Ref = string(dAtA[iNdEx:postIndex])
+			m.SessionID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		case 2:
 			if wireType != 2 {
@@ -8558,7 +8558,7 @@ func (m *InspectRequest) UnmarshalVT(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -8586,7 +8586,7 @@ func (m *InspectRequest) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Ref = string(dAtA[iNdEx:postIndex])
+			m.SessionID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
@@ -9207,7 +9207,7 @@ func (m *DisconnectRequest) UnmarshalVT(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -9235,7 +9235,7 @@ func (m *DisconnectRequest) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Ref = string(dAtA[iNdEx:postIndex])
+			m.SessionID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
@@ -9341,7 +9341,7 @@ func (m *ListRequest) UnmarshalVT(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -9369,7 +9369,7 @@ func (m *ListRequest) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Ref = string(dAtA[iNdEx:postIndex])
+			m.SessionID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
@@ -9640,7 +9640,7 @@ func (m *InputInitMessage) UnmarshalVT(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -9668,7 +9668,7 @@ func (m *InputInitMessage) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Ref = string(dAtA[iNdEx:postIndex])
+			m.SessionID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
@@ -10094,7 +10094,7 @@ func (m *InitMessage) UnmarshalVT(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -10122,7 +10122,7 @@ func (m *InitMessage) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Ref = string(dAtA[iNdEx:postIndex])
+			m.SessionID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		case 2:
 			if wireType != 2 {
@@ -10872,7 +10872,7 @@ func (m *StatusRequest) UnmarshalVT(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field SessionID", wireType)
 			}
 			var stringLen uint64
 			for shift := uint(0); ; shift += 7 {
@@ -10900,7 +10900,7 @@ func (m *StatusRequest) UnmarshalVT(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.Ref = string(dAtA[iNdEx:postIndex])
+			m.SessionID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
diff --git a/controller/remote/client.go b/controller/remote/client.go
index f28005c0..dd6b5b65 100644
--- a/controller/remote/client.go
+++ b/controller/remote/client.go
@@ -75,36 +75,36 @@ func (c *Client) List(ctx context.Context) (keys []string, retErr error) {
 	return res.Keys, nil
 }
 
-func (c *Client) Disconnect(ctx context.Context, key string) error {
-	if key == "" {
+func (c *Client) Disconnect(ctx context.Context, sessionID string) error {
+	if sessionID == "" {
 		return nil
 	}
-	_, err := c.client().Disconnect(ctx, &pb.DisconnectRequest{Ref: key})
+	_, err := c.client().Disconnect(ctx, &pb.DisconnectRequest{SessionID: sessionID})
 	return err
 }
 
-func (c *Client) ListProcesses(ctx context.Context, ref string) (infos []*pb.ProcessInfo, retErr error) {
-	res, err := c.client().ListProcesses(ctx, &pb.ListProcessesRequest{Ref: ref})
+func (c *Client) ListProcesses(ctx context.Context, sessionID string) (infos []*pb.ProcessInfo, retErr error) {
+	res, err := c.client().ListProcesses(ctx, &pb.ListProcessesRequest{SessionID: sessionID})
 	if err != nil {
 		return nil, err
 	}
 	return res.Infos, nil
 }
 
-func (c *Client) DisconnectProcess(ctx context.Context, ref, pid string) error {
-	_, err := c.client().DisconnectProcess(ctx, &pb.DisconnectProcessRequest{Ref: ref, ProcessID: pid})
+func (c *Client) DisconnectProcess(ctx context.Context, sessionID, pid string) error {
+	_, err := c.client().DisconnectProcess(ctx, &pb.DisconnectProcessRequest{SessionID: sessionID, ProcessID: pid})
 	return err
 }
 
-func (c *Client) Invoke(ctx context.Context, ref string, pid string, invokeConfig *pb.InvokeConfig, in io.ReadCloser, stdout io.WriteCloser, stderr io.WriteCloser) error {
-	if ref == "" || pid == "" {
-		return errors.New("build reference must be specified")
+func (c *Client) Invoke(ctx context.Context, sessionID string, pid string, invokeConfig *pb.InvokeConfig, in io.ReadCloser, stdout io.WriteCloser, stderr io.WriteCloser) error {
+	if sessionID == "" || pid == "" {
+		return errors.New("build session ID must be specified")
 	}
 	stream, err := c.client().Invoke(ctx)
 	if err != nil {
 		return err
 	}
-	return attachIO(ctx, stream, &pb.InitMessage{Ref: ref, ProcessID: pid, InvokeConfig: invokeConfig}, ioAttachConfig{
+	return attachIO(ctx, stream, &pb.InitMessage{SessionID: sessionID, ProcessID: pid, InvokeConfig: invokeConfig}, ioAttachConfig{
 		stdin:  in,
 		stdout: stdout,
 		stderr: stderr,
@@ -112,8 +112,8 @@ func (c *Client) Invoke(ctx context.Context, ref string, pid string, invokeConfi
 	})
 }
 
-func (c *Client) Inspect(ctx context.Context, ref string) (*pb.InspectResponse, error) {
-	return c.client().Inspect(ctx, &pb.InspectRequest{Ref: ref})
+func (c *Client) Inspect(ctx context.Context, sessionID string) (*pb.InspectResponse, error) {
+	return c.client().Inspect(ctx, &pb.InspectRequest{SessionID: sessionID})
 }
 
 func (c *Client) Build(ctx context.Context, options *pb.BuildOptions, in io.ReadCloser, progress progress.Writer) (string, *client.SolveResponse, *build.Inputs, error) {
@@ -137,7 +137,7 @@ func (c *Client) Build(ctx context.Context, options *pb.BuildOptions, in io.Read
 	return ref, resp, nil, eg.Wait()
 }
 
-func (c *Client) build(ctx context.Context, ref string, options *pb.BuildOptions, in io.ReadCloser, statusChan chan *client.SolveStatus) (*client.SolveResponse, error) {
+func (c *Client) build(ctx context.Context, sessionID string, options *pb.BuildOptions, in io.ReadCloser, statusChan chan *client.SolveStatus) (*client.SolveResponse, error) {
 	eg, egCtx := errgroup.WithContext(ctx)
 	done := make(chan struct{})
 
@@ -146,8 +146,8 @@ func (c *Client) build(ctx context.Context, ref string, options *pb.BuildOptions
 	eg.Go(func() error {
 		defer close(done)
 		pbResp, err := c.client().Build(egCtx, &pb.BuildRequest{
-			Ref:     ref,
-			Options: options,
+			SessionID: sessionID,
+			Options:   options,
 		})
 		if err != nil {
 			return err
@@ -159,7 +159,7 @@ func (c *Client) build(ctx context.Context, ref string, options *pb.BuildOptions
 	})
 	eg.Go(func() error {
 		stream, err := c.client().Status(egCtx, &pb.StatusRequest{
-			Ref: ref,
+			SessionID: sessionID,
 		})
 		if err != nil {
 			return err
@@ -184,7 +184,7 @@ func (c *Client) build(ctx context.Context, ref string, options *pb.BuildOptions
 			if err := stream.Send(&pb.InputMessage{
 				Input: &pb.InputMessage_Init{
 					Init: &pb.InputInitMessage{
-						Ref: ref,
+						SessionID: sessionID,
 					},
 				},
 			}); err != nil {
diff --git a/controller/remote/io.go b/controller/remote/io.go
index 6b8f7646..df28b445 100644
--- a/controller/remote/io.go
+++ b/controller/remote/io.go
@@ -43,9 +43,9 @@ func serveIO(attachCtx context.Context, srv msgStream, initFn func(*pb.InitMessa
 	if init == nil {
 		return errors.Errorf("unexpected message: %T; wanted init", msg.GetInput())
 	}
-	ref := init.Ref
-	if ref == "" {
-		return errors.New("no ref is provided")
+	sessionID := init.SessionID
+	if sessionID == "" {
+		return errors.New("no session ID is provided")
 	}
 	if err := initFn(init); err != nil {
 		return errors.Wrap(err, "failed to initialize IO server")
diff --git a/controller/remote/server.go b/controller/remote/server.go
index f586571b..a53486ad 100644
--- a/controller/remote/server.go
+++ b/controller/remote/server.go
@@ -53,9 +53,9 @@ func (s *session) cancelRunningProcesses() {
 func (m *Server) ListProcesses(ctx context.Context, req *pb.ListProcessesRequest) (res *pb.ListProcessesResponse, err error) {
 	m.sessionMu.Lock()
 	defer m.sessionMu.Unlock()
-	s, ok := m.session[req.Ref]
+	s, ok := m.session[req.SessionID]
 	if !ok {
-		return nil, errors.Errorf("unknown ref %q", req.Ref)
+		return nil, errors.Errorf("unknown session ID %q", req.SessionID)
 	}
 	res = new(pb.ListProcessesResponse)
 	res.Infos = append(res.Infos, s.processes.ListProcesses()...)
@@ -65,9 +65,9 @@ func (m *Server) ListProcesses(ctx context.Context, req *pb.ListProcessesRequest
 func (m *Server) DisconnectProcess(ctx context.Context, req *pb.DisconnectProcessRequest) (res *pb.DisconnectProcessResponse, err error) {
 	m.sessionMu.Lock()
 	defer m.sessionMu.Unlock()
-	s, ok := m.session[req.Ref]
+	s, ok := m.session[req.SessionID]
 	if !ok {
-		return nil, errors.Errorf("unknown ref %q", req.Ref)
+		return nil, errors.Errorf("unknown session ID %q", req.SessionID)
 	}
 	return res, s.processes.DeleteProcess(req.ProcessID)
 }
@@ -101,13 +101,13 @@ func (m *Server) List(ctx context.Context, req *pb.ListRequest) (res *pb.ListRes
 }
 
 func (m *Server) Disconnect(ctx context.Context, req *pb.DisconnectRequest) (res *pb.DisconnectResponse, err error) {
-	key := req.Ref
-	if key == "" {
-		return nil, errors.New("disconnect: empty key")
+	sessionID := req.SessionID
+	if sessionID == "" {
+		return nil, errors.New("disconnect: empty session ID")
 	}
 
 	m.sessionMu.Lock()
-	if s, ok := m.session[key]; ok {
+	if s, ok := m.session[sessionID]; ok {
 		if s.cancelBuild != nil {
 			s.cancelBuild()
 		}
@@ -116,7 +116,7 @@ func (m *Server) Disconnect(ctx context.Context, req *pb.DisconnectRequest) (res
 			s.result.Done()
 		}
 	}
-	delete(m.session, key)
+	delete(m.session, sessionID)
 	m.sessionMu.Unlock()
 
 	return &pb.DisconnectResponse{}, nil
@@ -137,26 +137,26 @@ func (m *Server) Close() error {
 }
 
 func (m *Server) Inspect(ctx context.Context, req *pb.InspectRequest) (*pb.InspectResponse, error) {
-	ref := req.Ref
-	if ref == "" {
-		return nil, errors.New("inspect: empty key")
+	sessionID := req.SessionID
+	if sessionID == "" {
+		return nil, errors.New("inspect: empty session ID")
 	}
 	var bo *pb.BuildOptions
 	m.sessionMu.Lock()
-	if s, ok := m.session[ref]; ok {
+	if s, ok := m.session[sessionID]; ok {
 		bo = s.buildOptions
 	} else {
 		m.sessionMu.Unlock()
-		return nil, errors.Errorf("inspect: unknown key %v", ref)
+		return nil, errors.Errorf("inspect: unknown key %v", sessionID)
 	}
 	m.sessionMu.Unlock()
 	return &pb.InspectResponse{Options: bo}, nil
 }
 
 func (m *Server) Build(ctx context.Context, req *pb.BuildRequest) (*pb.BuildResponse, error) {
-	ref := req.Ref
-	if ref == "" {
-		return nil, errors.New("build: empty key")
+	sessionID := req.SessionID
+	if sessionID == "" {
+		return nil, errors.New("build: empty session ID")
 	}
 
 	// Prepare status channel and session
@@ -164,7 +164,7 @@ func (m *Server) Build(ctx context.Context, req *pb.BuildRequest) (*pb.BuildResp
 	if m.session == nil {
 		m.session = make(map[string]*session)
 	}
-	s, ok := m.session[ref]
+	s, ok := m.session[sessionID]
 	if ok {
 		if !s.buildOnGoing.CompareAndSwap(false, true) {
 			m.sessionMu.Unlock()
@@ -183,12 +183,12 @@ func (m *Server) Build(ctx context.Context, req *pb.BuildRequest) (*pb.BuildResp
 	inR, inW := io.Pipe()
 	defer inR.Close()
 	s.inputPipe = inW
-	m.session[ref] = s
+	m.session[sessionID] = s
 	m.sessionMu.Unlock()
 	defer func() {
 		close(statusChan)
 		m.sessionMu.Lock()
-		s, ok := m.session[ref]
+		s, ok := m.session[sessionID]
 		if ok {
 			s.statusChan = nil
 			s.buildOnGoing.Store(false)
@@ -203,25 +203,25 @@ func (m *Server) Build(ctx context.Context, req *pb.BuildRequest) (*pb.BuildResp
 	defer cancel()
 	resp, res, _, buildErr := m.buildFunc(ctx, req.Options, inR, pw)
 	m.sessionMu.Lock()
-	if s, ok := m.session[ref]; ok {
+	if s, ok := m.session[sessionID]; ok {
 		// NOTE: buildFunc can return *build.ResultHandle even on error (e.g. when it's implemented using (github.com/docker/buildx/controller/build).RunBuild).
 		if res != nil {
 			s.result = res
 			s.cancelBuild = cancel
 			s.buildOptions = req.Options
-			m.session[ref] = s
+			m.session[sessionID] = s
 			if buildErr != nil {
-				var buildRef string
+				var ref string
 				var ebr *desktop.ErrorWithBuildRef
 				if errors.As(buildErr, &ebr) {
-					buildRef = ebr.Ref
+					ref = ebr.Ref
 				}
-				buildErr = controllererrors.WrapBuild(buildErr, ref, buildRef)
+				buildErr = controllererrors.WrapBuild(buildErr, sessionID, ref)
 			}
 		}
 	} else {
 		m.sessionMu.Unlock()
-		return nil, errors.Errorf("build: unknown key %v", ref)
+		return nil, errors.Errorf("build: unknown session ID %v", sessionID)
 	}
 	m.sessionMu.Unlock()
 
@@ -238,9 +238,9 @@ func (m *Server) Build(ctx context.Context, req *pb.BuildRequest) (*pb.BuildResp
 }
 
 func (m *Server) Status(req *pb.StatusRequest, stream pb.Controller_StatusServer) error {
-	ref := req.Ref
-	if ref == "" {
-		return errors.New("status: empty key")
+	sessionID := req.SessionID
+	if sessionID == "" {
+		return errors.New("status: empty session ID")
 	}
 
 	// Wait and get status channel prepared by Build()
@@ -248,12 +248,12 @@ func (m *Server) Status(req *pb.StatusRequest, stream pb.Controller_StatusServer
 	for {
 		// TODO: timeout?
 		m.sessionMu.Lock()
-		if _, ok := m.session[ref]; !ok || m.session[ref].statusChan == nil {
+		if _, ok := m.session[sessionID]; !ok || m.session[sessionID].statusChan == nil {
 			m.sessionMu.Unlock()
 			time.Sleep(time.Millisecond) // TODO: wait Build without busy loop and make it cancellable
 			continue
 		}
-		statusChan = m.session[ref].statusChan
+		statusChan = m.session[sessionID].statusChan
 		m.sessionMu.Unlock()
 		break
 	}
@@ -284,9 +284,9 @@ func (m *Server) Input(stream pb.Controller_InputServer) (err error) {
 	if init == nil {
 		return errors.Errorf("unexpected message: %T; wanted init", msg.GetInit())
 	}
-	ref := init.Ref
-	if ref == "" {
-		return errors.New("input: no ref is provided")
+	sessionID := init.SessionID
+	if sessionID == "" {
+		return errors.New("input: no session ID is provided")
 	}
 
 	// Wait and get input stream pipe prepared by Build()
@@ -294,12 +294,12 @@ func (m *Server) Input(stream pb.Controller_InputServer) (err error) {
 	for {
 		// TODO: timeout?
 		m.sessionMu.Lock()
-		if _, ok := m.session[ref]; !ok || m.session[ref].inputPipe == nil {
+		if _, ok := m.session[sessionID]; !ok || m.session[sessionID].inputPipe == nil {
 			m.sessionMu.Unlock()
 			time.Sleep(time.Millisecond) // TODO: wait Build without busy loop and make it cancellable
 			continue
 		}
-		inputPipeW = m.session[ref].inputPipe
+		inputPipeW = m.session[sessionID].inputPipe
 		m.sessionMu.Unlock()
 		break
 	}
@@ -379,14 +379,14 @@ func (m *Server) Invoke(srv pb.Controller_InvokeServer) error {
 					initErrCh <- retErr
 				}
 			}()
-			ref := initMessage.Ref
+			sessionID := initMessage.SessionID
 			cfg := initMessage.InvokeConfig
 
 			m.sessionMu.Lock()
-			s, ok := m.session[ref]
+			s, ok := m.session[sessionID]
 			if !ok {
 				m.sessionMu.Unlock()
-				return errors.Errorf("invoke: unknown key %v", ref)
+				return errors.Errorf("invoke: unknown session ID %v", sessionID)
 			}
 			m.sessionMu.Unlock()