Each terminal in a full-duplex communication system comprises a computer-controlled display screen such as a CRT, at least one input device such as a keyboard, a mouse or a light pen and bidirectional communication system through which the terminals are interconnected. Each communication comprises a...http://www.google.com/patents/US5245553?utm_source=gb-gplus-sharePatent US5245553 - Full-duplex video communication and document generation system
