VMS Help SHOW, INTRUSION, Qualifiers, /OLD  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    On VAX, displays the contents of the old kernel mode intrusion
    database. The kernel mode intrusion database was used by the
    system and layered products prior to OpenVMS VAX Version 6.1. It
    is still updated by the system to provide backwards compatability
    to applications that have not yet converted over to using the
    supported system services for access to the intrusion database.
    Entries added directly to the old kernel mode intrusion database
    by applications may be examined only by using the /OLD qualifier.