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Glossary 17
WH[WHGLWRU
An application program for editing text
files consisting exclusively of ASCII
characters. MS-DOS Editor and Notepad
(in Windows) are text editors, for exam-
ple. Most word processors use
proprietary file formats containing binary
characters, although some can read and
write text files.
WH[WPRGH
See video mode.
7)7
Abbreviation for thin film transistor. A flat-
panel display for notebook computers
where each pixel is controlled by one to
four transistors.
WSL
Abbreviation for tracks per inch.
WUDS
An alert, error, or system message from
a server reporting an exception (for exam-
ple, a device failure or a threshold
violation) in a server.
765
Abbreviation for terminate-and-stay-
resident. A TSR program runs in the
background. Most TSR programs imple-
ment a predefined key combination
(sometimes referred to as a hot key)
that allows you to activate the TSR pro-
grams interface while running another
MS-DOS program. When you finish using
the TSR program, you can return to the
other application program and leave the
TSR program resident in memory for later
use.
Because MS-DOS is not designed to
support multiple programs running simul-
taneously, TSR programs can sometimes
cause memory conflicts. When trouble-
shooting, rule out the possibility of such a
conflict by rebooting your computer with-
out starting any TSR programs.
8'$
Acronym for user-defined attribute.
8'3
Abbreviation for User Datagram Protocol.
8,'
User identification number.
8/
Abbreviation for Underwriters
Laboratories.
80%
Abbreviation for upper memory blocks.
See also conventional memory, HMA,
memory manager, and upper memory
area.
XSSHUPHPRU\DUHD
The 384 KB of RAM located between
640 KB and 1 MB. If the computer has an
Intel386 or higher microprocessor, a soft-
ware utility called a
memory manager
can
create UMBs in the upper memory area, in
which you can load device drivers and
memory-resident programs. See also
conventional memory, HMA, and memo-
ry manager.
836
Abbreviation for uninterruptible power
supply. A battery-powered unit that
automatically supplies power to your
computer in the event of an electrical
failure.
862&
Abbreviation for Universal Service Order-
ing Code.
XWLOLW\
A program used to manage system re-
sources memory, disk drives, or
printers, for example. The diskcopy com-
mand for duplicating diskettes and the
himem.sys device driver for managing ex-
tended memory are utilities included in
MS-DOS.
9
Abbreviation for volt(s).
9$&
Abbreviation for volt(s) alternating
current.