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data: Information that a computer can process. The word "data" is
D
actually plural for "datum," meaning a single piece of information.
data bits: A data communications parameter controlling the number of
bits used to represent a character. If data bits = 7, the computer can
generate 128 unique characters, if data bits = 8, the computer can
generate 256 unique characters.
decimal: The base-ten numbering system normally used by people.
Computers, in contrast, generally use binary or hexadecimal
numbering systems. See also binary, hexadecimal.
default: The values or options selected by the processor, a controller or
program when you do not specify a setting. For example, a preset
value in a dialog box or window.
delete: To remove information. Examples are removing a line of text
from within a program or removing files from a disk or other
storage device. Synonymous with erase.
deselect: To remove highlighting from text, such as an item in a list or
menu, or to remove handles from graphical objects.
device: A component attached to the computer. Internal devices include
the hard disk and screen. External devices you can connect to the
computer include a monitor, printer and port replicator.
device driver: A program that controls the operation of a specific device
such as the screen, CD-ROM drive or printer. The operating system
loads many device drivers when you turn on the computer.
dialog box: 1) A box requesting information. Typically it contains a
combination of buttons, lists and text-entry boxes. 2) A box
containing a message. It may tell you that a process has completed
successfully. Alternatively, it may be a warning that the computer
cannot do what you asked or that obeying your instructions may
destroy data. This second type of dialog box is also called a message
box.
DIMM: Dual Inline Memory Module. A unit of RAM used for memory
expansion.
direct current (DC): Electric current that flows in one direction. This type
of power is usually supplied by batteries.
241
Glossary
Part III: Appendixes
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