Unlike for 2001, where Arthur C. Clarke temporarily moved to New York to write the screenplay with Stanley Kubrick, Clarke chose to stay at home in Sri Lanka to write the screenplay for 2010. Thus, 2010 became the first film to include this then-nascent technology as part of its production. This innovation is generally credited as an invention by Ray Tomlinson when he made changes to a program called SNDMSG. Identify this now ubiquitous technology.