Viewdata explainer
A teletext page to explain Viewdata, the format used by Prestel. Teletext and Prestel pages share the same page layout, with graphics able to be used interchangeably between the two.
Tag / Viewdata
Viewdata is an information retrieval service that, unlike teletext, is 2-way communication. Prestel is the British implementation, and from 1974 it followed the same graphical layout as Ceefax and ORACLE. Requiring the use of a computer terminal, it could be termed as a precursor to the modern Internet.