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 twGaugeUpdate( aHandle, nPercent )
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     Update the gaugebar as the event it is associated with proceeds.

       Arguments:

     aHandle  - 'H' Bar Handle returned from twGaugeNew().

     nPerCent - 'N' Percent of event completed. The application must
                    calculate this before passing it.

       Return:

     NIL

       Example:

     twGaugeUpdate( nBarHandle, ( nCompleted / nTotal ) / 100 )