Alarm systems incorporating control and visual display apparatus; Announcement apparatus; Anti-theft warning apparatus; Apparatus for amplifying sound; Apparatus for broadcasting audio signals; Apparatus for broadcasting visual signals; Apparatus for carrying images; Apparatus for carrying sound; Apparatus for communication; Apparatus for controlling cameras; Apparatus for controlling lighting; Apparatus for controlling the storage of data; Apparatus for creating digital effects; Apparatus for data communications between computers; Apparatus for data transmitting; Apparatus for decoding encoded signals; Apparatus for displaying images; Apparatus for displaying information; Apparatus for displaying picture signals; Apparatus for displaying pre-recorded messages; Apparatus for gathering information; Apparatus for generating images; Apparatus for information transmission; Apparatus for input of data; Apparatus for inputting information into a computer; Apparatus for lighting control; Apparatus for measuring; Apparatus for message sending; Apparatus for personal use for protection against injury; Apparatus for processing data; Apparatus for processing digital data; Apparatus for processing digital video signals; Apparatus for processing information; Apparatus for processing video signals; Apparatus for programming data; Apparatus for protection against injury; Apparatus for reading data; Apparatus for receiving data; Apparatus for recoding digitally stored pictures; Apparatus for recording audio signals; Apparatus for recording images; Apparatus for recording sound; Apparatus for retrieving data; Apparatus for signalling; Apparatus for the conversion of data; Apparatus for the processing of data; Apparatus for the processing of digital information; Apparatus for the reproduction of images; Apparatus for the reproduction of pictures; Apparatus for the reproduction of sound; Apparatus for the transmission of sound or images; Apparatus for use in controlling pitch; Application software; Audio mixing console apparatus; Audio processing apparatus; Audio signal level controlling apparatus; Audiovisual devices (apparatus); Audiovisual teaching apparatus; Automatic dialling apparatus; Carrier transmission apparatus; Computer apparatus; Computer controlled sound apparatus; Computer controlled telecommunications exchange apparatus; Computer controllers for operating lighting apparatus; Computer memory storage apparatus; Control apparatus for determining position; Data acquisition apparatus; Data conversion apparatus; Data display apparatus; Data encryption apparatus; Data receiving apparatus; Data recording apparatus; Data transfer apparatus; Data transmission apparatus; Digital data transmission apparatus; Digital data transmitting apparatus; Digital signal processing apparatus; Digital telecommunications apparatus; Downloadable software applications (apps); Global positioning system (GPS) apparatus; High fidelity audio apparatus; Instructional apparatus; Instructional materials (apparatus); Intercom key apparatus for connection to telephone networks; Intercommunication apparatus; Message receiving apparatus; Message sending apparatus; Music centres incorporating sound and video recording and reproducing apparatus; Satellite apparatus; Security apparatus for receiving audio signals; Security apparatus for receiving video signals; Security apparatus for storing audio signals; Security apparatus for storing video signals; Security apparatus for transmitting audio signals; Security apparatus for transmitting video signals; Signalling apparatus for use in emergencies; Telephone communications apparatus; Telephone exchange apparatus; Training apparatus (teaching apparatus for teaching people); Voice transmission apparatus