ocr: Half duplex AC communication channel that allows for the transfer of information in both directions over the Internet, though not simultaneously. (See duplex, network.) Handle A made-up name chosen by a user who prefers not to use his/her real name in newsgroups or on IRC. (See newsgroups, IRC.) Handshaking A series of signals which two modems send to each other in order to confirm a satistactory connection. Handshaking occurs when you try to connect two computers via modem. Hard drive A computerized storage unit used to store data. Unlike other storage units such as CD- ROM, a hard drive is a ...