Two individuals credited with inventing the initial virtual bulletin board system, or BBS. In 1977-1978 in Chicago, Ward Christensen and Randy Seuss started a dial-in BBS called RCPM (Remote CP/M, an operating system).
Ward Christensen also developed the Xmodem File Transfer Protocol (FTP), which was another milestone in the history of the Internet because it was the first file transfer method for PCs that was generally obtainable.
Hardy, H. The History of the Net. [Online, May 14, 2001.] Hardy’s Carleton University Website. http://www.carleton.ca/~mflynnbu/internet_surveys/hardy.htm.