Windows Mobile 6.5
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This message is posted to the installing thread's message queue or sent to the appropriate TimerProc callback function after each interval specified in the SetTimer function used to install a timer.

WM_TIMER wTimerID = wParam; 
    tmprc = (TIMERPROC *) lParam;


Specifies the timer identifier.


Pointer to an application-defined callback function that was passed to the SetTimer function when the timer was installed.

An application should return zero if it processes this message.

The WM_TIMER message is a low-priority message. The GetMessage and PeekMessage functions retrieve this message only when no other higher-priority messages are in the thread's message queue.

Windows Embedded CEWindows CE 1.0 and later
Windows MobileWindows Mobile Version 5.0 and later