The MRCREQUEST structure has been revised. The mr_Reserved field has changed to mr_offUpdate, which is used for Update compression (micap_UPDCOMP) and Update SuperCompress (micap_SPRCOMP) compression only. When sending a request to a server, the mr_offUpdate field specifies the offset in the source buffer where the changed uncompressed data starts. The server responds to the request by copying, into mr_offUpdate, the offset in the destination buffer where the changed compressed data starts.