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PRSALT

       SUBROUTINE  PRSALT (ALTNAT)
 C$    (Parse - Alternate)
 C$    When there  are  alternate  parses possible  for  the  next
 C$    field, this  routine should  be  called with  the  argument
 C$    ALTPRS before  the first  of them,  and with  the  argument
 C$    .NOT.ALTPRS after the last of  them.  This allows the  help
 C$    facility  to  display  help   messages  for  each  of   the
 C$    alternatives.  If help had been requested when this routine
 C$    is called with argument .NOT.ALTPRS, the help character  is
 C$    deleted from the input buffer to avoid an infinite loop and
 C$    the line retyped to allow the user to add to IT
 C$    (23-FEB-83)