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; computers, computer hardware and peripherals therefor; keypads; computer programmes; computer software; computer software for use in preparing corporate presentations; computer software for use in education and training; training software; presentation software; compact discs and data carriers carrying software; graphics tablets; electronic mice; electronic apparatus for providing input to computers; publications in electronic form supplied on electronic data carriers, online from databases, or from facilities on the Internet, all for use in teaching or for education or training; electronic apparatus for providing input to interactive teaching apparatus; parts and fittings for all the aforesaid goods; instructional manuals in electronic format sold with the aforementioned goods