Apparatus and instruments for recording, reproducing and/or transmitting sound and/or video images; interactive video apparatus and instruments; sound and/or video recordings; computers; visual display units; interactive display apparatus; interactive terminals; computer software; interactive computer software; printed electronic circuit boards; electronic memory devices; magnetic tapes and/or discs; data stores, data printers, plotters, readers, interfaces, converters; disc and/or tape drives; video games; CD ROM; communications apparatus and instruments; head/ear phones; adaptors; digital interactive video adaptors for use with computers; ditigal video adaptors for displaying text with video pictures; drive consoles; cases; light guns; keyboards, joysticks, data input and output apparatus and instruments; parts and fittings therefor