Library /sys$common/syshlp/nclhelp.hlb set, osi_transport, template, security  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Default: Null value    Value: 00-FF

    An octet string to be transmitted in the security parameter of
    a CR or CC TPDU. A null value causes the security parameter to
    be omitted from the TPDU.

    set  [node node-id] osi transport template template-id -
         security octet-string

    Example:

    set osi transport template default security %xFF