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RTL Routines, LIB$, LIB$GET_PREV_INVO_HANDLE, Returns
 *Conan The Librarian 

    OpenVMS usage:invo_handle
    type:         longword (unsigned)
    access:       write only
    mechanism:    by value

    An invocation handle for the invocation context that is previous
    to that which was specified as the target.
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