Description

   Call the SOR$RETURN_REC routine to release the sorted or merged
   records to a program. Call this routine once for each record to
   be returned.

   SOR$RETURN_REC places the record into a record buffer that you
   set up in the program's data area. After SORT has successfully
   returned all the records to the program, it returns the status
   code SS$_ENDOFFILE, which indicates that there are no more
   records to return.

   Some of the following condition values are used with different
   severities, depending on whether SORT/MERGE can recover. Thus,
   if you want to check for a specific status, you should use
   LIB$MATCH_COND.