A computer network allows sharing of resources and information among devices connected to the network. The Advanced Research Projects Agency (ARPA) funded the design of the "Advanced Research Projects Agency Network" (ARPANET) for the United States Department of Defense. It was the first operational computer network in the world.Development of the network began in 1969, based on designs developed during the 1960s. For a history see ARPANET, the first network.

 Network classification

The fol...

Health

The responsibility for health care is devolved to the constituent countries of the United Kingdom: England, Wales, Scotland and Northern Ireland. In all countries, health care is predominantly funded through national taxation. Within each county, the responsibility for purchasing health services is being devolved to local bodies (Primary Care Trusts in England, Health Boards in Scotland, local health groups in Wales and Primary Care Partnerships in Northern Ireland). Primary care servi...