Viewdata

Touch-tone teletext provides many of the services of viewdata and teletext at the low cost intended for teletext alone.

A viewdata system can be succinctly described as an information and message service […]

The two European systems use an "alphamosaic" method of delivering data to a viewdata terminal screen.

A particularly important application of intelligent viewdata terminals is in telesoftware where the viewdata network is used for the distribution […]