Microsoft KB Archive/108938

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INFO: Windows WM_SYSTIMER Message Is an Undocumented Message

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Q108938

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The information in this article applies to:


 * Microsoft Win32 Software Development Kit (SDK)
 * Microsoft Windows Software Development Kit (SDK) 3.1

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SUMMARY
The WM_SYSTIMER message in Windows is an undocumented system message; it should not be trapped or relied on by an application. This message can occasionally be viewed in Spy or in CodeView while debugging.

Windows uses the WM_SYSTIMER message internally to control the scroll rate of highlighted text (text selected by the user) in edit controls, or highlighted items in list boxes.

NOTE: The WM_SYSTIMER message is for Windows's internal use only and can be changed without prior notice.

Additional query words:

Keywords : kbOSWinNT kbGrpDSUser kbOSWin kbWndw kbWndwMsg

Issue type : kbinfo

Technology : kbWin32SDKSearch kbAudDeveloper kbWin3xSearch kbSDKSearch kbWin32sSearch kbWinSDKSearch kbWinSDK310