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In WinMain() why do we return(msg.wParam)

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What exactly happens when msg.wParam is returned at the end of WinMain. Is it totally necessary?

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Returning the value of the WPARAM from the WM_QUIT message signifies that your application has terminated normally. If you return 0 it may signify that the application terminated before it reached the message loop.

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It doesn't really matter.
It can be helpful if you launch that executable from another process and have the return values actually mean something (i.e. the exe did as desired or a particular error occured).

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