Killing a window timer prevents the WM_TIMER message from being generated for that timer, but it doesn't retroactively remove ones that were already generated

Raymond Chen December 5, 2014 Dec 5, 2014 12/5/14

Calling Kill­Timer to cancel a window timer prevents WM_TIMER messages from being generated for that timer, even if one is overdue. In other words, give this sequence of operations: no WM_TIMER message is ever generated. Even though a timer became due during the Sleep, no timer message was generated during the sleep because timer ...