Apparatus for controlling computer programmes; Apparatus for inputting information into a computer; Apparatus for linking computers; Apparatus for linking computers into networks; Compact disc players for use with computers; Computer apparatus; Computer apparatus adapted for use with visual display units; Computer apparatus for the control of data; Computer apparatus for the storage of data; Computer apparatus for the transmission of telephone calls; Computer apparatus for use in local area networks; Computer apparatus for use with computer networks; Computer based apparatus for use in the enhancement of video signals; Computer components; Computer control apparatus; Computer control devices; Computer control units; Computer controlled desk top recording; Computer controlled sound apparatus; Computer firmware; Computer graphics software; Computer hard disc apparatus; Computer hardware; Computer housings; Computer mainframes; Computer operating programs; Computer software; Computer software (programs); Computer software (recorded); Computer software packages; Computer software products; Computer software programs; Computer systems; Computer terminals; Computers; Personal computers; Personal computers incorporating computer software; Personal home computers; Speakers for computers