H
half-duplex (1) A setting causing characters that you
enter on your computer to be echoed not from a remote
system but on your screen. (2) A two-wire circuit designed
for communications in either direction but not both
directions simultaneously.
handshaking A protocol for devices to exchange
information about the communications connection itself,
such as when to start and stop transmitting.
host computer The Macintosh in which your modem is
installed.
I
input (1) Information transferred into a computer from
some external source, such as the keyboard, a disk drive, or
a modem. (2) The act or process of transferring such
information.
interface The devices, rules, or conventions by which one
component of a system communicates with another.
I/O Input/output; the transfer of information into and out
of a computer.
ITU International Telecommunications Union.
J
jack A socket used for a telephone line or other electrical
connections.
75
Glossary
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