Fills the clipping region in the specified device context with the desktop pattern or wallpaper.
HDC hdc // handle to DC);
DECLAREINTEGER PaintDesktop IN user32;
[in] Handle to the device context.
If the function succeeds, the return value is nonzero.
* fills the client part of the form with the desktop pattern* the fill is highly volatileLOCAL hWindow, hDC
hWindow = THIS.HWnd&& _screen.HWnd
hDC = GetDC(m.hWindow)&& GetWindowDC(...)
= ReleaseDC(m.hWindow, m.hDC)
You may call this function from within the Paint event of a form and see what happens to form`s native controls, which controls are windowless by definition.