Microsoft KB Archive/93045

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DSWAP Increases by 16 Bytes Each Time an MS-DOS Program Is Run

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Q93045

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The information in this article applies to:


 * Microsoft Windows versions 3.1, 3.11
 * Microsoft Windows for Workgroups versions 3.1, 3.11

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Each time you run an MS-DOS-based application in standard mode of either Windows or Windows for Workgroups, the size of DSWAP.EXE in memory increases by 16 bytes. This guarantees that each MS-DOS session starts at a unique address.

MS-DOS keeps track of per-process information such as open files using the address of the program segment prefix. If the size of DSWAP did not increase, two MS-DOS-based applications could be started with the same program segment prefix, and the system would have difficulty distinguishing between them.

Additional query words: 3.10

Keywords :

Issue type :

Technology : kbAudDeveloper kbWin3xSearch kbWFWSearch kbWin310 kbWin311 kbWFW310 kbWFW311