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RTL Routines, LIB$, LIB$I64_PREV_INVO_END, Argument
 *Conan The Librarian 

 invo_context

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

    Address of a valid invocation context block previously used for
    call tracing.
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