In August of 1962 he envisioned a globally interconnected set of computers that would allow everyone to quickly access data and programs (Comer 25). A government-sponsored project at Defense Advanced Research Projects Agency (DARPA) started in October 1962 (Comer 32). The discovery of such technology became a race between the Soviet Union and the United States of America. Both countries wanted control of the possibly powerful tool (Comer 36). In 1965, Thomas Merrill and Lawrence G. Roberts created the first wide-area computer. This experiment proved that computers could work together running programs and retrieving data as necessary on remote machines. In 1966 Roberts put together his plan for ARPAnet (Advanced Research Projects Agency). In 1968, the National Physical Laboratory in Great Britain set up the first test network, this encouraged the Pentagon's ARPA to fund a larger project in the United States (Comer 38). In August 1968, a refined model of ARPAnet was released for the development of one of the key components, the packet switches IMP (Interface Message Processors). ARPA awarded the ARPAnet contract to Bolt Beranek and Newman (BBN). BBN had selected a Honeywell minicomputer as the base on which they would build the switch. The physical network was constructed by the end of 1969 during the Vietnam War, linking four nodes: University of California Santa Barbara, Stanford Research Institute, the University of Utah and the University of California Los Angeles. In 1972, the first e-mail program was created by Ray Tomlinson of BBN. ARPAnet was currently using the Network Control Protocol (NCP) to transfer data. This allowed communications between hosts running in the same network. As the Internet grew quickly, changes were necessary. The Internet's decentralized structure made it easy to expand but its NCP did not have the ability to address networks further downstream than the destination IMP.