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The history of the CSNET is a story of enterprising academic entrepreneurship, and yet another example of TCP/IP's inexorable drive to spread. Vannevar Bush wrote the first visionary description of the potential uses for information technology with his description of the "memex" automated library system. Wiener changed the way everyone thought about computer technology, influencing several later developers of the Internet, most notably J.C.R. Licklider. To meet this need, ARPA established the IPTO in 1962 with a mandate to build a survivable computer network to interconnect the DoD's main computers at the Pentagon. Like Norbert Wiener and J.C.R. Licklider, McLuhan made a study of the extrapolation of current trends in technology, and specialized in the effects on human communications. In 1970, Davies helped build a packet switched network called the Mark I to serve the NPL. He developed his ideas further in his 1963 Ph.D. thesis, and then published a comprehensive analytical treatment of digital networks in his book Communication Nets in 1964. The Interface Message Processor provided a system independent interface to the ARPANET that could be used by any computer system. Most university computers that were connected to it were moved to networks connected to the NSFNET, passing the torch from the old network to the new. In 1975, a two-network TCP/IP communications test was performed by establishment of a link between Stanford and University College London. Starting in 1979, the National Science foundation (NSF) funded development of the CSNET to link computer science departments in universities not connected to the ARPANET. Shortly thereafter in 1989, John Gamble, the new CERN TCP/IP Coordinator, connected their network to the EUnet, thereby providing full TCP/IP connectivity to the ARPANET. Partly in fulfillment of that dream, he invented the first graphical user interface and computer mouse.