A method for sending a video stream from a source node (106A-D) to a display node (108A-D) through a network, the method comprising: in the source node, sending capabilities data to a stream manager such that the stream manager can use the capabilities data to select an interchange format, wherein the capabilities data represents one or more video signal processing capabilities of the source node; in the source node, receiving source control information from the stream manager, wherein the source control information specifies the interchange format and at least one display node to address; and sending the video stream through the network in the interchange format to the display node for display by the display node; and wherein: the stream manager is different from the display node; the source control information specifies one or more additional display nodes that are different from the display node; the method further comprising: in the source node and in response to the source control information, sending at least part of the video stream to the display node and to the additional display nodes; and in the source node, sending a portion of the video stream to the display node and sending a respective different portion to each of the additional display nodes; and wherein the portion and the respective different portions are defined by one or more area of interest signals received by the source node from the stream manager. in the source node, sending capabilities data to a stream manager such that the stream manager can use the capabilities data to select an interchange format, wherein the capabilities data represents one or more video signal processing capabilities of the source node; in the source node, receiving source control information from the stream manager, wherein the source control information specifies the interchange format and at least one display node to address; and sending the video stream through the network in the interchange format to the display node for display by the display node; and wherein: the stream manager is different from the display node; the source control information specifies one or more additional display nodes that are different from the display node; the method further comprising: in the source node and in response to the source control information, sending at least part of the video stream to the display node and to the additional display nodes; and in the source node, sending a portion of the video stream to the display node and sending a respective different portion to each of the additional display nodes; and wherein the portion and the respective different portions are defined by one or more area of interest signals received by the source node from the stream manager. the stream manager is different from the display node; the source control information specifies one or more additional display nodes that are different from the display node; the method further comprising: in the source node and in response to the source control information, sending at least part of the video stream to the display node and to the additional display nodes; and in the source node, sending a portion of the video stream to the display node and sending a respective different portion to each of the additional display nodes; and in the source node and in response to the source control information, sending at least part of the video stream to the display node and to the additional display nodes; and in the source node, sending a portion of the video stream to the display node and sending a respective different portion to each of the additional display nodes; and wherein the portion and the respective different portions are defined by one or more area of interest signals received by the source node from the stream manager.