(Alpha and I64 only.) The Get Invocation Context routine gets the
    invocation context of any active procedure.

    Format

      LIB$GET_INVO_CONTEXT   invo_handle, invo_context

1 - Returns

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

2 - Arguments

 invo_handle

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

    Handle for the desired invocation. Returned by LIB$GET_INVO_
    HANDLE.

 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 frame specified by invo_handle will be written.