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Integrated Services Digital Network (ISDN): A worldwide
communications network for delivering telephone and data services.
It uses two types of communications channel: a B channel, which
carries voice, graphics and data at 64 Kbps, and a D channel, which
carries control information for signalling at 16 Kbps. A basic ISDN
installation typically provides two B channels and one D channel.
Intelligent Input/Output (I
output to an auxiliary processor. The auxiliary processor (I/O
processor) manages the data transfer while the CPU is busy doing
something else.
interface: A connection between two parts of a system that lets them
work together. There are different types of interface: (1) Elements
such as the graphics design, prompts, and menus of a program allow
you to interact with the program. These elements make up the user
interface. (2) A physical connection between one system or device
and another so that information can be exchanged.
interlacing: A method of refreshing a computer screen, in which only
every other line of pixels is refreshed. Interlaced monitors take two
passes to create a complete screen image.
Internet: The collection of computers located throughout the world that
are connected over telephone lines to provide electronic mail and
other services.
intranet: World Wide Web pages designed to serve a limited group of
people, such as the employees of a particular company. Users must
enter a password to access the information.
K
keyboard: The device you use to type information into the computer.
Each key on the keyboard is a switch that is activated when you
press it. The switch sends a specific code, representing the character
printed on the key, to the processor.
keyboard shortcut: A key or combination of keys you use to perform a
task instead of using a pointing device, such as a mouse.
kilobyte (KB): A unit of data storage equal to 1024 bytes. Although kilo
means 1000, for computers it refers to 1024, or 2 raised to the 10th
power. See also byte.
O): A standard for offloading input and
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Glossary
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