Prestel
In 1983, the Prestel messaging service known as “Prestel Mailbox” was launched, initially hosted on the computer known as "Enterprise", and later available from all IRC computers by means of a centralised messaging computer known as "Pandora". This facility extended the original day one concept of “Response Frames” whereby an end user could send a message back to the IP who owned the page via special pages, for example to order goods or services. The user’s name, address, telephone number, and date could be added automatically to the message when the IP set up the response frame by means of codes which triggered extraction of key data from the users account held on the IRC computer. Initially response frames were ingathered by an IP from each IRC individually, but later the facility to collect messages from all IRCs at the UDC from where they could be ingathered centrally was implemented, and with the introduction of Mailbox, they could be retrieved from any IRC.
Internet in the United Kingdom
Peter T. Kirstein's research group at University College London was one of the first international connections on the ARPANET in 1973, alongside Norwegian Seismic Array (NORSAR) and Sweden's Tanum Earth Station. Kirstein co-authored (with Vint Cerf) one of the most significant early technical papers on the internetworking concept. His research group at UCL adopted TCP/IP in 1982, a year ahead of ARPANET, and played a significant role in the very earliest experimental Internet work. Kirstein's group included Sylvia Wilbur who programmed the computer used as the local node for the network.