methods , systems , and products describe a video overlay processor connected to a system data bus and to a media bus . the video overlay processor superimposes a first audio - visual signal over a second audio - visual signal to produce a superimposed signal and sends the superimposed signal to the system data bus . a network bus connects to the system data bus and receives the superimposed signal . a data switch connects to the network bus , receives the superimposed signal , and sends the superimposed signal to one or more switch ports of the data switch .