A text-editing system includes a central processor unit, a bus connected to the central processor unit and input terminals connected to the bus for entering text and editing commands into the system. Text is displayed by the system on visual display apparatuses that are associated with each input terminal...http://www.google.ca/patents/US4150429?utm_source=gb-gplus-sharePatent US4150429 - Text editing and display system having a multiplexer circuit interconnecting plural visual displays
