VMS Help System Services, $SETDFPROT, Arguments  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 new-def-prot-addr

    OpenVMS usage:file_protection
    type:         word (unsigned)
    access:       read only
    mechanism:    by reference
    A word that specifies the new default file protection
    specification. The new-def-prot-addr argument is the address
    of the word that specifies the desired protection. If you do not
    want the process-default file protection to be changed, specify
    the value 0.

 cur-def-prot-addr

    OpenVMS usage:file_protection
    type:         word (unsigned)
    access:       write only
    mechanism:    by reference
    A word that is to receive the current default file protection
    specification. The cur-def-prot-addr argument is the address of
    the word that receives the current process-default protection. If
    you do not want the current default file protection, specify the
    value 0.