VMS Help DCE_SECURITY, Admin Intro, DCE$IMPORT, IMPORT, Qualifiers, /EXCLUDE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /EXCLUDE
       /NOEXCLUDE (default)

    Determines whether or not the OpenVMS account is imported
    to the DCE registry. If the OpenVMS account is not imported
    then the DCE account is not created and instead an entry
    is created in the IMPORT exclude file for the specified
    OpenVMS account.