Description

   The SOR$PASS_FILES routine passes input and output file
   specifications to SORT. The SOR$PASS_FILES routine must be
   repeated for multiple input files. The output file name string
   and characteristics should be specified only in the first call to
   SOR$PASS_FILES.

   This routine also accepts optional arguments that specify
   characteristics for the output file. By default, the output file
   characteristics are the same as the first input file; specified
   output file characteristics are used to change these defaults.

   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.