System for allowing user of any computer to draw image over that generated by the host computer and replicating the drawn image to other computers

  • US 5,649,104 A
  • Filed: 03/19/1993
  • Issued: 07/15/1997
  • Est. Priority Date: 03/19/1993
  • Status: Expired due to Term
First Claim
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1. A method of operating a group of interlinked computers, one of which runs a single instance of a shared program which can be controlled by others, comprising the following steps:

  • a) designating each computer as (1) Viewer, (2) Annotator, or (3) Controller;

    b) allowing no Viewer to perform annotation or issue commands to said program;

    c) allowing Annotators to annotate their own displays, and make copies of the annotations at Viewers, Annotators, and Controllers;

    d) allowing no Annotator to operate the shared program; and

    e) allowing a Controller toi) operate the shared program orii) act as an Annotator;

    wherein one or more of the operations described in paragraphs a, b, c, d, and e are accomplished by a computer program which is distinct from the shared program.

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