To discuss videotex in a comparative context we need some agreed meaning of the term, yet it becomes evident after a little investigation that there is no clearly delineated or universally accepted meaning. Some authors see the videotex as a generic term for “disseminating information electronically for display on terminals or modified TV receivers. The original systems were called Teletext and Viewdata.” (Cakewell, 1991, p.698). The connotation ‘video’ seems to derive from the reference to the terminal as a video display unit, or VDU, since the use of video-tape is not strictly necessary in either broadcast (Teletext) or datacoms (Viewdata) or data transmitted by a telecommunications medium such as a telephone line or a cable which connects computers.
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