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UpdateWindow()
Ensure any pending changes to the client area are made
------------------------------------------------------------------------------

Syntax
UpdateWindow( <hWnd> )   -->   nil

Arguments
<hWnd> is the handle to the window.

Returns
NIL.

Description
This function makes sure any pending changes are flushed.  It
is not usually necessary to call UpdateWindow().

Example
hWnd = CreateWindow( "SampleApp", "Sample App Window Title",    ;
                     WS_OVERLAPPEDWINDOW,                       ;
                     NIL, NIL, NIL, NIL,                        ;
                     NIL, NIL, hInst )
     .  .  .
UpdateWindow( hWnd )