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Glossary
5.375 x 8.375 ver 3.1
color palette — A set of specified colors that establishes the colors
that can be displayed on the screen at a particular time.
compatibility — The extent to which computers, programs, or
devices can work together harmoniously, using the same
commands, formats, or language as another.
configuration — (1) The collection of components that make up a
single computer system. (2) How parts of the system are set up
(that is, configured).
controller — A device that controls the transfer of data from a
computer to a peripheral device and vice versa. For example, disk
drives, monitors, keyboards, and printers all require controllers.
CPU — See central processing unit (CPU).
CPU cache — A section of very fast memory residing between the
CPU and the computer’s main memory that temporarily stores
data and instructions the CPU will need to execute commands
and programs. See also cache, L1 cache, L2 cache.
cursor — A symbol that indicates the current position on the
screen. The shape of the cursor varies, depending on the program
you’re using and what you’re doing.
D
default — The setting selected by a program when the user does
not specify an alternative setting.
device — A component attached to the computer. Devices may be
external (outside the computer’s case) or internal (inside the
computer’s case). Printers, disk drives, and modems are
examples of devices.
device driver — A program (called a “driver”) that permits a
computer to communicate with a device.
dialog box — An on-screen window displayed by the operating
system or a program giving a direction or requesting input from
the user.
direct current (DC) — The type of power usually supplied by
batteries. DC flows in one direction. Compare alternating current
(AC).