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Terminal access controller
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<p>A terminal access controller (TAC) is a host computer that accepts <a href="/facts/Computer_terminal/fSlx05qV">terminal</a> connections, usually from <a href="/facts/Dial-up/gfhNU9s3">dial-up</a> lines, and that allows the user to invoke Internet remote log-on procedures, such as <a href="/facts/Telnet/hxT0e85h">Telnet</a>. </p>