COMPUTER SYSTEMS FOR NETWORKING, COMPRISING COMPUTER PROGRAMS AND NETWORK COMPUTERS, COMPRISING FILE SERVERS, COMMUNICATION SERVERS, APPLICATION SERVERS, MONITORS, KEYBOARDS, MEMORY CARDS, PROCESSOR CARDS, PROCESSOR BOARDS, DISK CONTROLLER BOARDS, REMOTE DIAGNOSTIC PROCESSOR BOARDS, DISKS, AND DISK SUB-SYSTEMS COMPRISING DISK DRIVES, EXPANSION CABINETS AND A DISK CONTROLLER