VMS Help RTL Routines, LIB$, LIB$GET_ACCNAM_BY_CONTEXT, Arguments  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 contxt

    OpenVMS usage:context
    type:         longword (unsigned)
    access:       read only
    mechanism:    by reference

    The address of a nonzero longword context value returned by $GET_
    SECURITY or $SET_SECURITY.

 accnam

    OpenVMS usage:access_names
    type:         longword (unsigned)
    access:       write only
    mechanism:    by reference

    The address of a longword into which this routine writes the
    address of the access name table.