Parameter

filespec[,...] or filespec[+...]

   Specifies one or more intermediate binary files (.BRN) that
   contain information (index entries, page number references, and
   so on) for making an index. To create a .BRN file, use the RUNOFF
   command with the /INTERMEDIATE qualifier. See the RUNOFF command
   for more information on the /INTERMEDIATE qualifier.

   If you omit the input file type, the DSR Indexing utility uses
   a default file type of .BRN. The RUNOFF/INDEX command also
   processes .BIX files that the previous version of DSR produced.

   For single input files, the DSR Indexing utility produces an
   output file with the same file name as the input file. The output
   file type is .RNX.

   If you separate multiple input files with commas (,),  separate
   .RNX files for each input file are created. If you separate
   multiple input files with plus signs (+),  a single .RNX file
   that contains indexing information for all of the input files
   is created. The default output file name is the same as the
   first input file name; the default file type is .RNX. Wildcard
   characters are not allowed in the file specification.