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Method of and system for updating a display unit

  • US 5,255,361 A
  • Filed: 04/04/1991
  • Issued: 10/19/1993
  • Est. Priority Date: 12/19/1988
  • Status: Expired due to Term
First Claim
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1. In an information processing system having a host system which communicates with a remote system, a computer program, that executes on and controls said information processing system, to selectively update a remote display unit associated with said remote system to display information being stored at said host system, said computer program comprises:

  • means for determining differences between information being displayed on said remote display unit and said information being stored at said host system to be displayed on said remote display unit by comparing the contents of a host display buffer with the contents of a remote display buffer associated with said remote display unit;

    means for selectively one of a plurality of change categories in response to said determining means; and

    means for transmitting an update command from said host system to said remote system in response to said selected one of said plurality of change categories whereby only information which is different is transmitted to said remote system to update said remote display unit.

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