Library /sys$common/syshlp/helplib.hlb  —  RTL Routines, LIB$  LIB$GET_INVO_HANDLE, Returns
    OpenVMS usage:invo_handle
    type:         longword (unsigned)
    access:       write only
    mechanism:    by value

    Invocation handle of the invocation context that was passed.
    If the returned value is LIB$K_INVO_HANDLE_NULL, the invocation
    context that was passed was invalid.
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