Its primary purpose is to facilitate focused discussion threads within topical categories ( Usenet newsgroups), but it also allows the transfer of files. 1979 – Usenet conceived by Tom Truscott and Jim Ellis at the University of North Carolina at Chapel Hill and Duke University.BBS access is limited to phone lines until the early 1990s. February 1978 – Ward Christensen's CBBS becomes the first Bulletin board system.1976 – Xmodem a point-to-point binary transfer protocol by Ward Christensen.Comparison of Internet Relay Chat clients.( Learn how and when to remove this template message) ( June 2016) ( Learn how and when to remove this template message) Please improve this article by removing excessive or inappropriate external links, and converting useful links where appropriate into footnote references. This article's use of external links may not follow Wikipedia's policies or guidelines.
