Prestel: flaws in the indexing tree.
Viewdata is a generic name for a system that links people to computer-based data through an adapted TV set and the telephone. It is expensive; information providers can spend hundreds of thousands of pounds a year on information frames that still have limited use. In Britain the main system is called Prestel. Pauline Drummond examines its relevance for the health service, particularly in the light of recent experiments.
D000043:Abstracting and Indexing; D007256:Information Systems / Q000295:instrumentation*; D013690:Television / Q000295:instrumentation*; D006113:United Kingdom