VMS Help MERGE, Output File Qualifiers, /SEQUENTIAL, Example  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  $ SORT/KEY=(POS:1,SIZ:80) STATS.DAT SUMMARY.LIS/SEQUENTIAL

      Because the input file STATS.DAT is not a sequential file and
      the output file SUMMARY.LIS will be, /SEQUENTIAL qualifies the
      output file specification.