CD-ROM. Compact disc read-only
memory.
combination keys. Keys that have spe-
cific functions when you hold them down
at the same time.
CONFIG.SYS. A file that contains a
group of commands to load installable
device drivers and reserve space in
system memory for information proc-
essing. This file is referred to by DOS
during system startup.
configuration. (1) The manner in which
hardware and software of an information
processing system are organized and
interconnected, (2) The physical and
logical arrangement of devices and pro-
grams that make up a data processing
system, (3) The devices and programs
that make up a system, subsystem, or
network.
CRT. Cathode ray tube display.
device driver. (1) A file that contains
the code needed to use an attached
device. Operating system loads device
drivers for screens. (2) A program that
enables a computer to communicate with
a specific peripheral device—for
example, a printer, a video disc player, or
a CD drive. (3) A collection of subrou-
tines that control the interface between
I/O device adapters and processors.
DIMM. Dual inline memory module.
directory. A type of file containing the
names and controlling information for
other files or other directories.
DMA. Direct memory access. The
transfer of data between memory and
input/output units without processor inter-
vention.
double-click. To press and release a
mouse button twice within a time frame
defined by the user, without moving the
pointer off the choice.
DRAM. Dynamic random access
memory.
ECP. Extended Capability Port.
EDO DRAM. Enhanced data output
dynamic random access memory.
EGA. Enhanced graphics adapter.
EIA. Electronics Industries Association.
EIA-232D. An EIA interface standard
that defines the physical, electronic, and
functional characteristics of an interface
line that connects a communication
device and associated workstation. It
uses a 25-pin connector and an unbal-
anced line voltage.
EMS. Expanded memory specification.
FAQ. Frequently asked questions.
fax. (1) Facsimile machine. (2) A trans-
mitted document from a facsimile
machine.
FDD. Floppy disk drive.
fixed disk. In personal computing, fixed
disk is synonymous with hard disk.
Flash memory. Electrically rewritable
storage.
folder. A file used to store and organize
documents.
fuel gauge. An indicator on the screen
that constantly shows the current power
status of the battery pack.
HDD. Hard disk drive.
HHR. Half-horizontal resolution.
hibernation mode. One of the power-
saving methods that stores data and
applications running in the computer's
memory on the hard disk. During
hibernation, the computer is automatically
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ThinkPad X20 User's Reference
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