different between subscriber vs viewdata

English

subscribe +? -er

subscriber (plural subscribers)

A person who subscribes to a publication or a service.
(programming) A system or component that subscribes to something, such as an event, made available by a publisher.

view +? data

viewdata (usually uncountable, plural viewdatas)

(often attributive) An information retrieval service of the 1970s and 1980s permitting subscribers to access a remote database and receive requested data on a video display.
- 1980, InfoWorld (volume 2, number 1)
  Touch-tone teletext provides many of the services of viewdata and teletext at the low cost intended for teletext alone.
- 1981, New Scientist
  The two European systems use an "alphamosaic" method of delivering data to a viewdata terminal screen.

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