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long pascal DefWindowProc(HWND hWnd, WORD message, WORD wParam, DWORD lParam)

  This function calls the default window procedure for the window
class which hWnd belongs to. This function should be used when you
"subclass" a window by installing a different window procedure in
front of it. Any messages which your window procedure does not process
should be passed on to the default window procedure.

Parameters
  hWnd, message, wParam, and lParam are the arguments to your window
procedure.

Returns
  Returns the value that the default window procedure returns.