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Viewdata is a Videotex implementation. It is a type of information retrieval service in which a subscriber can access a remote database via a common carrier channel , request data and receive requested data on a video display over a separate channel.
From the information-provider point of view, there were huge differences between Viditel and Videotex: Via Viditel all data was normally stored on the central computer(s) owned and managed by KPN: to update the information in the system you connected to the Viditel computer and via a terminal-emulation application you could edit the information.
Samuel Fedida, OBE (4 May 1918 – 10 August 2007) was an Egyptian-born British telecommunication engineer responsible at Post Office Telecommunications for the development of Viewdata. [1] Fedida was born in Alexandria, Egypt. [2] He had the idea for Viewdata in 1968 after reading a publication with the title The Computer as Communications ...
Prestel was the brand name of a videotex service launched in the UK in 1979 by Post Office Telecommunications, a division of the British Post Office. [a] It had around 95,500 attached terminals at its peak, [2] and was a forerunner of the internet-based online services developed in the late 20th and early 21st centuries. [3]