/sys$common/syshlp/helplib.hlb DIFFERENCES, Qualifiers, /SLP  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Requests that the DIFFERENCES command produce an output file
    suitable for input to the SLP editor. If you use the /SLP
    qualifier, you cannot specify any of the following output file
    qualifiers: /MERGED, /PARALLEL, /SEPARATED, or /CHANGE_BAR.

    Use the output file produced by the SLP qualifier as input to
    SLP to update the master input file, that is, to make the master
    input file match the revision input file.

    When you specify the /SLP qualifier and you do not specify the
    /OUTPUT qualifier, the DIFFERENCES command writes the output file
    to a file with the same file name as the master input file with
    the file type DIF.