Apparatus for data communications between computers; apparatus for inputting information into a computer; apparatus for linking computers; apparatus for protecting computers from electrical power supply faults; apparatus for receiving information from a computer; apparatus for use in communications between computers; business programmes for computers; communication devices for linking computer networks; communications electronics for computers; communications processing computer software; computer aided design (CAD) apparatus; computer apparatus; computer apparatus for recording telephone calls; computer apparatus for remote billing; computer apparatus for remote meter reading; computer apparatus for the control of data; computer apparatus for the management of telephone calls; computer apparatus for the transmission of telephone calls; computer apparatus for transmitting data; computer apparatus for use in local area networks; computer apparatus having speech generation capabilities; computer communication apparatus; computer communications modems; computer controlled telecommunications exchange apparatus; computer networking installations; computer networks; computer programs for the control of telecommunication apparatus; computer programs for the control of telecommunication instruments; computer programs for use in telecommunications; computer programs for use with facsimile apparatus; computer programs recorded on carriers; computer programs recorded on data carriers; computer programs recorded on disc; computer programs recorded on magnetic media; computer programs relating to local area networks; computer related data communication apparatus; computer related voice communication apparatus; computer software; computer software (programs); devices for use in the networking of computers; electrical communications apparatus for use with interconnecting computers; electronic apparatus for linking televisions to computers; industrial computer software programs; mobile work stations (computer, other than furniture); telecommunications apparatus for transferring data to computers; telecommunications apparatus for transmitting data for use with computers