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 twInkeyWait( nSecs )
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     This function is taken from the Nantucket source accompanying
     Clipper 5.01. It allows SET KEYS to be processed during an INKEY
     call. This function is used by all TSDWIN functions instead of
     INKEY().

       Arguments:

     nSecs - 'N' Wait time in seconds. (0 - Wait forever)

       Return:

     Last key pressed.

       Example:

     twInkeyWait( 5 )