Windows WM_SYSTIMER Message Is an Undocumented Message

 Last reviewed: November 2, 1995
Article ID: Q108938
The information in this article applies to:
  • Microsoft Windows Software Development Kit (SDK) versions 3.1
  • Microsoft Win32 Application Programming Interface (API) included with: 

        - Microsoft Windows NT versions 3.5 and 3.51
    - Microsoft Windows 95 version 4.0

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 reference words: 3.00 3.10 3.50 3.51 4.00 95
KBCategory: kbui
KBSubcategory: UsrMsg

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Last reviewed: November 2, 1995
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