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

 invo_context

    OpenVMS usage:invo_context_blk
    type:         structure
    access:       write only
    mechanism:    by reference

    Address of an invocation context block into which the procedure
    context of the caller will be written.