Electro-optical sensors; Fibre optical sensors; Wireless pulse transmitters; Wireless receiving apparatus; Wireless transmitters; Computer network apparatus; Computer network installations; Cellular telecommunications apparatus; Cellular telecommunications instruments; Computer programs for use in telecommunications; Computer games programs downloaded via the internet (software); Computer programs (downloadable software); Apparatus for data processing; Computer apparatus for use in local area networks; Computer programs relating to local area networks; Local area networking apparatus for the switching of data; Local area networking apparatus for the transmission of data; Network management computer software; Global positioning system (GPS) apparatus; Integrated circuit cards; Computer chips; Microprocessors