Wireless apparatus and instruments; wireless feedback apparatus; teaching apparatus and instruments; electronic apparatus for recording, processing, storage, input or output of images, data or text; receivers; transmitters; interactive teaching apparatus; display apparatus; hardware tablets; graphic tablets; computer monitors; computers, computer hardware and peripherals therefor; keypads; electronic pens; electronic input devices for use with computers; input devices for use with interactive teaching apparatus; computer programmes; computer software; educational software; digital projectors; flat panel display screens; video conferencing apparatus; electronic databases recorded on computer media; downloadable publications; discs, tapes, cartridges, cassettes and other memory or data carriers; pre-recorded memory carriers; pre-recorded data carriers; pre-recorded memory carriers bearing educational material or material for learning; pre-recorded data carriers bearing educational material or material for learning; parts and fittings for all the aforesaid goods