Present and future computer communications requirements are considered. Present computing is characterized primarily by three well-established paradigms: timesharing, transaction, and mainframe. Each of these is examined. To understand future needs, trends in computer paradigms and technology are examined. Innovative uses of data communications are considered under circumstances in which voice orientation is not a factor, a computational perspective is operative, and new communications options are available. Developments in processor power and system software are briefly considered, and client-server systems and the networks that make them possible are covered in depth. The much more demanding data communication requirements of client-server systems are stressed. >