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Integrated Services Digital Network (ISDN): A world-wide 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
2
O): A standard for offloading input and output to an auxiliary
processor. The auxiliary processor (I/O processor) manages the data transfer
while the CPU does 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.
interlaced: 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 provided.
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.
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