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ITsVISTA KB-Link: KB941561

After you set the value of the EventMask parameter to WTS_EVENT_FLUSH in the WTSWaitSystemEvent function, no pending calls to the function return on a Windows Vista-based computer

On a Windows Vista-based computer, you develop an application by using the WTSWaitSystemEvent function. When you set the value of the EventMask parameter to WTS_EVENT_FLUSH, all pending WTSWaitSystemEvent function calls on the specified terminal server handle are returned. However, no pending calls to the WTSWaitSystemEvent function return as expected.

Note: This problem does not occur on a Windows XP Service Pack 2 (SP2)-based computer.

There is a download that resolves this issue. See Hotfixes for details. This issue is resolved in SP1.

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB941561.

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