"Multimedia" intercommunication between workstations having auxiliary unit directly connected to output of workstation and input to display wherein local and remote image data are combined

Claim 1

A multimedia intercommunication installation between a plurality of users, said installation including for each of said users: a workstation having a screen, a main processing unit providing a source of local image data, data input means including at least a keyboard for providing a source of control data, and an auxiliary processing unit directly connected between an output of the main processing unit and an input of the screen for supplying said screen with a video image derived at least in part from said local image data, said auxiliary processing unit comprising data input means for selectively receiving said control data from said keyboard to thereby define a desired multimedia intercommunication, auxiliary image input means for connection to a source of remote image data, pixel output means responsive to said local image data, to said remote image data and to said control data, for supplying said screen with said processed video image in the form of pixel data incorporating at least portions of both said local image data and said remote image data for simultaneous display of the screen in accordance with said desired multimedia intercommunication, and interconnection means including an interconnection for selectively transmitting the local image data to another said workstation and for receiving the remote image data from that other workstation.