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long pascal (pascal *WinSetWinProc(HWND hWnd, long (pascal *pfFunc))())

  This function sets the window procedure associated with a window.
Every window has a default window procedure when it is created. You
should install your own window procedure if you want to process
messages meant for that wndow in a way which is different from the
default window procedure.

Parameters
  hWnd is the handle of the window whose window procedure we want to set.
  pfFunc is a pointer to the new window procedure. The window
   procedure must be defined as follows :
    long pascal pfFunc(HWND hWnd, WORD message, WORD wparam, DWORD
                        lParam)

Returns
  The address of the old window procedure. NULL is returned if the
window handle was invalid.