(p. 27) ... merging previously disparate technologies of communication and representation into a single medium.

The networked computer acts like a telephone in offering one-to-one real-time communication, like a television in broadcasting moving pictures, like an auditorium in bringing groups together for lectures and discussion, like a library in offering vast amounts of textual information for reference, like a museum in its ordered presentation of visual information, like a billboard, a radio, a gameboard and even like a manuscript in its revival of scrolling text.