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166 Glossary
controller) that provides the video capabilities—in
combination with the monitor—for your computer.
video memory — Memory that consists of memory chips
dedicated to video functions. Video memory is usually
faster than system memory. The amount of video memory
installed primarily influences the number of colors that a
program can display.
video mode — A mode that describes how text and
graphics are displayed on a monitor. Graphics-based
software, such as Windows operating systems, displays in
video modes that can be defined as x horizontal pixels by y
vertical pixels by z colors. Character-based software, such
as text editors, displays in video modes that can be
defined as x columns by y rows of characters.
video resolution — See resolution.
virus — A program that is designed to inconvenience you
or to destroy data stored on your computer. A virus
program moves from one computer to another through an
infected disk, software downloaded from the Internet, or
e-mail attachments. When an infected program starts, its
embedded virus also starts.
A common type of virus is a boot virus, which is stored in
the boot sectors of a floppy disk. If the floppy disk is left in
the drive when the computer is shut down and then
turned on, the computer is infected when it reads the
boot sectors of the floppy disk expecting to find the
operating system. If the computer is infected, the boot
virus may replicate itself onto all the floppy disks that are
read or written in that computer until the virus is
eradicated.
V — volt — The measurement of electric potential or
electromotive force. One V appears across a resistance of
1 ohm when a current of 1 ampere flows through that
resistance.
W
W — watt — The measurement of electrical power. One
W is 1 ampere of current flowing at 1 volt.
WHr — watt-hour — A unit of measure commonly used
to indicate the approximate capacity of a battery. For
example, a 66-WHr battery can supply 66 W of power for
1 hour or 33 W for 2 hours.
wallpaper — The background pattern or picture on the
Windows desktop. Change your wallpaper through the
Windows Control Panel. You can also scan in your favorite
picture and make it wallpaper.
WLAN — wireless local area network. A series of
interconnected computers that communicate with each
other over the air waves using access points or wireless
routers to provide Internet access.
write-protected — Files or media that cannot be changed.
Use write-protection when you want to protect data from
being changed or destroyed. To write-protect a 3.5-inch
floppy disk, slide its write-protect tab to the open
position.
WWAN — wireless wide area network. A wireless high-
speed data network using cellular technology and covering
a much larger geographic area than WLAN.
WXGA — wide-aspect extended graphics array — A video
standard for video cards and controllers that supports
resolutions up to 1280 x 800."
X
XGA — extended graphics array — A video standard for
video cards and controllers that supports resolutions up to
1024 x 768.
Z
ZIF — zero insertion force — A type of socket or connector
that allows a computer chip to be installed or removed with
no stress applied to either the chip or its socket.
Zip — A popular data compression format. Files that have
been compressed with the Zip format are called Zip files
and usually have a filename extension of .zip. A special
kind of zipped file is a self-extracting file, which has a
filename extension of .exe. You can unzip a self-extracting
file by double-clicking it.
Zip drive — A high-capacity floppy drive developed by
Iomega Corporation that uses 3.5-inch removable disks
called Zip disks. Zip disks are slightly larger than regular
floppy disks, about twice as thick, and hold up to 100 MB
of data.