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What value I would get if I send for example WM_USER + 100 to window, that have no handler for it (should it process it to DefWindowProc)?
If you know that the window definitely does not have a handler for the message, then you will get a value of 0. If you don't know for sure, don't rely on it - windows often post messages to themselves for doing various things, and they can have any value and may not be documented.
Ryan
"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"