I've received the following reply from DRPC's author, Jiri Stehlik, this morning:
Hello David, This error message gets generated whenever you try to specify more then o ne DDR stage in a single pipeline. Like 'PIPE DDR | ... | DDR'. It also gets generated if an instance of DDR crashed and the local variab le used to detect multiple instances was not cleared, if this happens you ca n clear it manually by executing: GLOBALV SET DDRPIPES OFF Hope this helps -Jiri Stehlik z/VM I/O Development IBM Endicott Have a good one.... DJ