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.