Source : Free On-Line Dictionary of Computing

ubiquitous computing
     
        Computers everywhere.  Making many computers available
        throughout the physical environment, while making them
        effectively invisible to the user.  Ubiquitous computing is
        held by some to be the Third Wave of computing.  The First
        Wave was many people per computer, the Second Wave was one
        person per computer.  The Third Wave will be many computers
        per person.  Three key technical issues are: power
        consumption, user interface, and wireless connectivity.
     
        The idea of ubiquitous computing as invisible computation was
        first articulated by Mark Weiser in 1988 at the Computer
        Science Lab at {Xerox PARC}.
     
        {(http://www.ubiq.com/hypertext/weiser/weiser.html)}.
     
        (1994-12-23)