Interface Message Processor

…group that designed the network’s Interface Message Processor, which would mediate between the network and each institution’s host computer. Second, and perhaps more important, in 1972 Kahn helped organize the first International Conference on Computer Communication, which served as the ARPANET’s public debut.

…connected a packet-switching computer, the Interface Message Processor (IMP), to a SDS Sigma 7 computer, which became the first node on ARPANET, which was originally planned to have four nodes. On October 29, 1969, Kleinrock and his student Charley Kline sent the first message over ARPANET to an IMP and…

…handled by smaller computers called interface message processors (IMPs) rather than the large mainframes that would be the nodes of ARPANET. Roberts modified the ARPANET plan to incorporate Clark’s suggestion. On October 29, 1969, American computer scientist Leonard Kleinrock and his student Charley Kline sent the first message over ARPANET…