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Screen manager multiple viewport for a multi-tasking data processing system

  • US 4,807,142 A
  • Filed: 10/09/1984
  • Issued: 02/21/1989
  • Est. Priority Date: 10/09/1984
  • Status: Expired due to Term
First Claim
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1. In a multi-tasking data processing system including memory means for storing data residing in document structures and active tasks, including a foreground task and one or more background tasks, each of said tasks being operable for directing operations to be performed on data and CPU means responsive to the tasks for operating on the data, screen manager means for creating visual display screens upon a display screen, the visual display screens representing data residing in a corresponding document structure to be displayed in association with corresponding active tasks, comprising:

  • means responsive to active tasks for creating a screen manager control structure within the memory means,the screen manager control structure includinginformation relating each screen to a corresponding task, andfor each screen,information expressive at least of formatting information relative to the screen, andinformation relating the screen to the data residing in the document structure to be displayed therein, andmeans responsive to the corresponding tasks and corresponding screen manager control structures to access and display the corresponding data associated with the foreground task.

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