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                                    FLUSH                                     
       command codes = 7 and 11
               ES:BX   pointer
                       length          field
       This  call  tells  the driver to flush  (terminate)  all  pending
       requests that it has knowledge of. Its primary use  is  to  flush
       the input queue on  character  devices.  The  driver must set the
       status word in the request header upon return. | 
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