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1. (n.) A logical connection or channel for data flow in a communications system. Transmission Control Protocol (TCP) and User Datagram Protocol (UDP), which are transport layer protocols for Ethernet, use port numbers to demultiplex messages. 2. (v.) To translate software so that it runs on different platforms. 3. (n.) The product that results from translating software for a different platform. 4. (n.) A socket for connecting peripheral cables to a computer.