Terminal access controller
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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.{{cite report|url=https://apps.dtic.mil/sti/citations/ADA147366 |title=TAC Users' Guide |last=Clifford |first=Robin |date=September 1989 |publisher=Defense Technical Information Center |page=1 |access-date=2024-08-26}}