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 twInit( Thickness )
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     Clears or initializes the internal stack used to store window
     information. Its initial use is automatic, but it may be used to
     free memory as an application runs.  All current window
     information will be lost.

       Arguments:

     Thickness - 'N' 1 for thin shadows
                     2 for thick shadows (Default)

       Return:

     0

       Example:

     twInit( 1 )