. . "Where the data stream comprises a video stream, the operations represented in block 1400 may be accomplished by, for example, DSR System 210 of Client 200 receiving I frames at a first destination port number (e.g., 5151) and P and B. frames at one or more destination port numbers other than the first destination port number (e.g., P and B frames both at port number 5153 or P and B frames at port" . .