Microsoft KB Archive/103406

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Full Screen MS-DOS Application Runs Slowly

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Q103406

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The information in this article applies to:


 * Microsoft Windows NT Server version 3.1
 * Microsoft Windows NT Workstation version 3.1
 * Microsoft Windows NT Advanced Server, version 3.1

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SYMPTOMS
At times, your graphical, MS-DOS-based application runs very slowly in full-screen mode. You may notice this behavior is triggered by switching the application between an icon and full screen state. Also, if you press a key, the application speeds up for a short time.

CAUSE
The Windows NT virtual MS-DOS machine (VDM) enabled idle time detection while the application was in full-screen mode. Because Windows NT does not trap video activity while an MS-DOS - based application is running in full-screen mode, it assumes the application is idle and reduces its execution priority. The reason the application speeds up when you press a key is that Windows NT detects keystrokes at all times; when the activity is noted, the status of the application is changed from idle to active.

RESOLUTION
If you experience this behavior, use PIF Editor to create a program information file (PIF) for your application. In the Advanced Options dialog box, disable Detect Idle Time under Multitasking Options.

Additional query words: prodnt

Keywords : kb3rdparty kbinterop

Issue type :

Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW310 kbWinNTSsearch kbWinNTS310 kbWinNTAdvSerSearch kbWinNTAdvServ310 kbWinNTS310xsearch kbWinNT310xSearch kbWinNTW310Search