In this computer graphics display system, individual viewports of arbitary arrangement, number and content are produced on a video screen. The graphics content, display parameters and interviewport spacing all are specified by a set of control word sequences stored in a control table. Each sequence is...http://www.google.de/patents/US4533910?utm_source=gb-gplus-sharePatent US4533910 - Graphics display system with viewports of arbitrary location and content
