/sys$common/syshlp/helplib.hlb RTL Routines, LIB$, LIB$GET_INVO_HANDLE, Argument  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 invo_context

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

    Address of an invocation context block. Here, only the frame
    pointer and stack pointer fields of an invocation context block
    must be defined.