How do you put a bitmap background in Win32 app window

Hello could you please point out to me on msdn witch functions are used to create a BITMAP background on Win32 app

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Originally Posted by gaar321

Hello could you please point out to me on msdn witch functions are used to create a BITMAP background on Win32 app

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Could you please rephrase your question?
An application doesn’t have a background.

See here and here.
If though it's MFC, you can see what the process is so you can translate to Win32.