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T1
A high bandwidth cable connection, used for telecommunications or wide area networking. A T1 connection has a speed of 1.544mbps and was developed by AT&T in 1957.
TCP/IP
Transfer Control Protocol / Internet Protocol. The common data communication mode that makes the Internet work. TCP/IP is not a program or a language, but a protocol that defines how data packets are transferred from one computer or network to another.
TIFF
Tagged Image File Format. TIFF is a very common format for saving print graphics. It was originally created by the now defunct Aldus Corporation. The resolution, file size, and colour depth available in TIFF are basically limitless.
Token Ring Network
A network arranged in a circular fashion where a message is transmitted from one member to another. It is the token that gives the holder the ability to transmit.
Trojan Horse
A program downloaded from the Internet that contains hidden destructive elements to a computer. Unlike a true virus, the Trojan horse does not replicate itself. A Trojan horse can come disguised as a useful application such as a game or application.
TWAIN
Technology Without An Interesting Name. Actually its the interface used by a input device such as a scanner to import images (generally graphics) into the computer.