INFO: Windows WM_SYSTIMER Message Is an Undocumented Message (108938)


The information in this article applies to:

  • Microsoft Platform Software Development Kit (SDK) 1.0
This article was previously published under Q108938

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.
Modification Type:MinorLast Reviewed:7/11/2005
Keywords:kbinfo kbWndw KB108938 kbAudDeveloper
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