9 COMPUTING LOCAL AREA NETWORKS, NAMELY INDIVIDUAL COMPUTER WORKSTATIONS CONNECTED TO A CENTRAL COMPUTER PROVIDING SOFTWARE, DATABASE, FILE STORAGE, AND ACCESS TO CONNECTED MAINFRAMES, MICROCOMPUTERS, PERSONAL COMPUTERS, AND OTHER LOCAL AREA NETWORKS, PRINTERS AND MODEMS, WITH CENTRALIZED FILE BACKUP, FILE MANAGEMENT, SYSTEM MAINTENANCE, DATA FILES, APPLICATION LOADING AND SECURITY CONTROL