A method is disclosed to provide commands to an information storage and retrieval comprising one or more data storage devices, where one or more first communication links interconnect one or more host computers and the data storage and retrieval system. The method supplies a computing device, where that computing device is external to the data storage and retrieval system, and where that computing device is external to each of the one or more host computers. Applicants' method further supplies a second communication link interconnecting the computing device and the data storage and retrieval system. The computing device generates a command signal, where said command signal comprises one or more command control words and a header. The computing device then provides that command signal to the data storage and retrieval system via the second communication link.