Local area network and wide area network computer hardware and computer software, computer network interface (or adapter) cards for use on computers, together with modems in combination therewith, wiring structural components, HUBs and concentrators, controlled attachment modules, controlled access units and multistation access units, repeaters, bridges, routers, multiprotocol routers and brouters, modems, network management computer hardware, video conferencing computer hardware and manuals for use therewith sold as a unit