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 UpdateWindow()         Updates the client area of a window
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   Syntax:              UpdateWindow( <hWnd> )  --> nil

   Parameters:

   <hWnd>               Identifies the window to be updated.

   Returns:             nil

   Observations:        This function sends a WM_PAINT to the
                        window forcing it to be repainted.

   Sample:              SOURCE\\CLASSES\\Window.prg

   Source code:         SOURCE\\WINAPI\\WndUpdat.c

   See also:            CLASS TWindo METHOD Refresh()