Noun
videotex (usually uncountable, plural videotexes)
Any of various early information retrieval services, such as viewdata and Teletext systems, that delivered pages of computerized text to users on request.
Viewdata is a Videotex implementation. Source: Internet
And because the main Videotex service used the network and modified PAD devices as infrastructure the name Datanet 1 was used for these services as well. Source: Internet