Comment by _Nat_

Sounds like Teletext was basically a digital-magazine protocol.

This is, a TV-station would continuously broadcast the latest Teletext-magazine for Teletext-clients to cache. Then users could view articles from their local cache.

Reference: https://en.wikipedia.org/wiki/Teletext

EDIT: Apparently most implementations wouldn't cache something until the user requested it, then the user would wait until the next send.