Taskbar

A program within Microsoft Windows that graphically represents open applications, computer contents, and other information, and provides a way to quickly access these resources. 

TCP/IP

Transmission Control Protocol/Internet Protocol. The suite of communications protocols used to connect hosts on the Internet. See also: Protocol, Host, and Internet.

Telecommunications

All type of data transmission. 

Token Ring

A type of computer network in which all the computers are arranged in a physical or logical circle. A special bit pattern known as a token travels around the circle. When a computer in the network wishes to send a message, it catches the token, attaches a message to it, and it continues to travel around the network. See also: Network.

Toner

A dry, powdery substance that is electrically charged so that it adheres to a drum, plate, or piece of paper in a laser printer or photocopier charged with the opposite polarity. 

Topology

The shape of a communication system such as a LAN. See also: Logical Topology, Physical Topology, and LAN.

Twisted-pair 

A type of cabling used for data and voice communications that consists of pairs of copper wires twisted inside an outer jacket. See also: Cable, UTP, and STP.