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IOPCLS

       LOGICAL FUNCTION  IOPCLS (UNIT)
 C$    (Close)
 C$    Close the file  associated with FORTRAN  unit number  UNIT,
 C$    dissociating the unit number completely from the file,  and
 C$    making  it  available  for  re-use.   The  function   value
 C$    returned is .TRUE. if successful, and .FALSE. if the  close
 C$    could not  be  performed.  If  the  close fails,  the  unit
 C$    number  is  NOT  available  for  re-use.   In  a   portable
 C$    implementation in FORTRAN 66, where a close facility is not
 C$    available in  the  language, this  function  should  simply
 C$    return .FALSE.
 C$    (09-MAR-84)