VMS Help SORT, Specification File Qualifiers, /CHECK_SEQUENCE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Specifies whether or not the sequence of records in the input
    files is checked when files are merged. By default the sequence
    of records is not checked. Use only with the MERGE command.

    Formats

      /CHECK_SEQUENCE

      /NOCHECK_SEQUENCE

1 - Full Description

    By default, Merge does not check the sequence of records in
    the input files. If you want to override that default, specify
    /CHECK_SEQUENCE in your specification file text.

2 - Example

  /NOCHECK_SEQUENCE

      The /NOCHECK_SEQUENCE qualifier overrides Merge's default
      behavior.