Terminal access controller From Wikipedia, the free encyclopedia A terminal access controller (TAC) is a host computer that accepts terminal connections, usually from dial-up lines, and that allows the user to invoke Internet remote log-on procedures, such as Telnet.[1] References [1]Clifford, Robin (September 1989). TAC Users' Guide (Report). Defense Technical Information Center. p. 1. Retrieved 2024-08-26. This computing article is a stub. You can help Wikipedia by adding missing information.vte Related Articles