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 ChangeProc()           Changes the procedure of a Window
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   Syntax:              ChangeProc( <hWnd> )  --> <nOldProc>

                        This function replaces the procedure that controls
                        the behavior of a function, for a FiveWin special one.

                        RestProc() replaces again this new procedure for
                        the old one.

   Parameters:

   <hWnd>               The handle of the window to change its proc.

   Returns:

   <nOldProc>           A number ( long pointer ) of the old procedure.

   Observations:        This function is used internally by FiveWin to
                        automatically subclass windows and controls and to
                        make them compatible with the OOPS architecture of
                        FiveWin.


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