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Method for Distinguishing Keys That Have the Same ASCII Code Point

IP.com Disclosure Number: IPCOM000039782D
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01

Publishing Venue

IBM

Related People

Authors:
Heath, AW [+details]

Abstract

A method is described which permits different functions to be performed when the ASCII definition of a dedicated key is the same as the ASCII definition of 'control +' another key. When using a low-function generalized operating system on a Personal Computer (PC), applications do not have direct control over the hardware and must also coexist in environments of which the application designer has no knowledge. These problems did not exist for early word processing applications, such as Displaywriter because the Displaywriter application was itself both application and an operating system controlling the hardware. The first migrations of Displaywriter to the PC (called DisplayWrite 2 and 3) avoided the problem by rearranging keyboards to avoid the problem.