Desktop publishing apparatus; desktop publishing programmes; computer design hardware; computer hardware; computer hardware for use in computer-assisted software engineering; computer hardware publications in electronic form; computer programs for analysing computer hardware; computer programs for testing computer hardware; data communications hardware; electronic hardware for image processing; hardware for the channel expansion of recorders; monitors (computer hardware); security devices for computer hardware; 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 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 programs for the creation of networks; computer programs relating to computer networks; computer programs relating to local area networks; connecting elements for communication networks; devices for use in the networking of computers; electronic networking apparatus for telephone systems; installations for use in forming computer networks; installations for use in the networking of computers; 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; network applications being computer programs; network controlling apparatus; network junction points for telephone exchange networks; packet switching networks; receiving devices for connection to communication networks; video local area network controllers; computer networking apparatus; computer networking ins tallations; electric switches; communication interface units; computer interface apparatus; computer interface cards; computer interface devices; computer interface units; computer interfaces; electrical interfaces; electronic interface apparatus; electronic interfaces; card readers