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  MSBUTCLEAR()                                                Mouse Function
 Purpose..: Clear the previous mouse press queue
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 Syntax...: MsButClear() --> NIL

 Arguments: none    

 Returns..: NIL

 Source...: MSCLEAR.C
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 Example..: The example shows how to purge the mouse queue.

      if ( ( nKey := inkey(.01) ) == 0 )  // Get any pending keystrokes
         MsButClear( )  ;;                // Clear out old presses
         nMsButton := MsButton( )         // Get button info from the queue
      endif