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IOPPOP

       LOGICAL FUNCTION  IOPPOP (UNIT)
 C$    (Pop Unit Number)
 C$    Return the FORTRAN unit  number, UNIT, from  the top of  an
 C$    internal  stack,  popping  the  stack  one  position.   The
 C$    function  value  returned  is  .TRUE.  if  successful,  and
 C$    .FALSE. if the stack is empty.
 C$    (02-FEB-82)