invo_context OpenVMS usage: invo_context_blk type: structure access: modify mechanism: by reference Address of a valid invocation context block. index OpenVMS usage: index type: longword access: read mechanism: by value Index into the IREG array of the invocation context block. gr_copy OpenVMS usage: integer value type: quadword access: read mechanism: by reference Address of a quadword that contains the value to be written to the invocation context block.