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Methods and apparatus for a selectable backdrop

  • US 5,634,102 A
  • Filed: 08/07/1995
  • Issued: 05/27/1997
  • Est. Priority Date: 08/07/1995
  • Status: Expired due to Term
First Claim
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1. In a digital computer having a display screen, a method for executing an application program in a backdrop mode that makes said application program non-removable from said display screen, comprising:

  • designating said application program for execution in said backdrop mode, said application program being capable of being designated for execution in one of said back-drop mode and a non-backdrop mode;

    executing said application program;

    intercepting, using substitute subroutines external to said application program, selected data destined for said application program, thereby preventing said application program from responding to said selected data in a manner normally expected of said application program if said application program executes in said non-backdrop mode, said selected data including data for causing said application program to quit execution; and

    disabling a close option in said display screen to prevent a user of said digital computer from issuing a command to quit execution of said application program while said application program executes in said backdrop mode, wherein said method permits codes in said application program to remain substantially uncharged irrespective of whether said application program executes in said non-backdrop mode or in said backdrop mode.

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