Prestel (abbrev. from press telephone), the brand name for the UK Post Office's Viewdata technology, was an interactive videotex system developed during the late 1970s and commercially launched in 1979. It achieved a maximum of 90,000 subscribers in the UK and was eventually sold by BT in 1994.
Read more about Prestel: Initial Developers, The Database, The Information Providers' View, The Users' View, Prestel Infrastructure, Prestel Computer Hardware and Software, Prestel Monitoring Equipment, Prestel Messaging, Public Take-up of The Service, Successes, Other Implementations, Homelink