Apparatus for managing energy supplies; Devices for measuring energy; Devices for switching over energy tariffs; Energy control devices; Solar energy operating apparatus; Access interfaces for managed private circuit networks; Apparatus for linking computers into networks; Apparatus for network communication; Apparatus for telephone networks; Apparatus for transmitting data by the telephone network; Apparatus for use in communications networks; Cabling networks (installations) incorporating fibre optic cables; Capacitance resistance networks; Communication devices for linking computer networks; Communications networks; Computer apparatus for use in local area networks; Computer apparatus for use with computer networks; Computer installations (networks); Computer network apparatus; Computer network installations; Computer network operating installations; Computer networking apparatus; Computer networking installations; Computer networks; Computer networks for the communication of data; Computer networks for the processing of data; Computer networks for the storage of data; Computer programs for the creation of networks; Computer programs relating to computer networks; Computer programs relating to local area networks; Connecting elements for communication networks; Data networks; Data transmission networks; Devices for use in the networking of computers; Diagnostic viewers for evaluating the condition of local area network installations; Diagnostic viewing transceivers for evaluating local area network apparatus; Electronic industrial network apparatus for high speed data transmission; Electronic networking apparatus for telephone systems; Installations for use in forming computer networks; Installations for use in the networking of communications apparatus; Installations for use in the networking of computers; Integrated circuits for networks for use in identification; Integrated service digital network installations; Integrated services digital network components; Intercom key apparatus for connection to telephone networks; Intercom key terminals for connection to a telephone network; Interface network modems; Linked computer networks; Local area networking apparatus for the switching of data; Local area networking apparatus for the transmission of data; Local area networks; Local optical fibre networks; Memory apparatus for telecommunications network design; Memory apparatus for telecommunications network management; Modems for communications networks; Network anti-interference filters; Network applications being computer programs; Network boards; Network connector for radio networks; Network controllers being computer apparatus; Network controlling apparatus; Network junction points for telephone exchange networks; Network management apparatus; Network management computer software; Network management control apparatus; Network protection devices (electric); Network protection devices (electronic); Network terminating apparatus (electric or electronic); Networks for the interconnection of communication systems; Optical networks; Radio for radio communication networks; Receiving devices for connection to communication networks; Repeaters for use in data networking; Resistor networks; Telecommunications apparatus for use in cellular radio networks; Telecommunications instruments for use in cellular radio networks; Telecommunications network management installations; Telecommunications networks; Value added network apparatus; Video local area network controllers; Voice apparatus for analogue network apparatus; Voice apparatus for digital network apparatus