Apparatus for programming data; automatic programming apparatus; business programmes for computers; computer programs for commercial transactions; computer programs for promotional purposes; computer programs for sales purposes; computer programs for use in communications; computer programs in the field of communication links; time programmers; computer programs for use by travel agencies; travel adaptors for electric plugs; travel distance monitors; travel guides in the form of audio recordings; travel guides in the form of video recordings; travelling wave tubes; network management computer software; operating computer software for main frame computers