230 Glossaryvideo resolution — See resolution.virus — A program that is designed to inconvenience you or to destroy data stored onyour computer. A virus program moves from one computer to another through aninfected disk, software downloaded from the Internet, or e-mail attachments. Whenan 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 floppydisk. If the floppy disk is left in the drive when the computer is shut down and thenturned on, the computer is infected when it reads the boot sectors of the floppy diskexpecting to find the operating system. If the computer is infected, the boot virus mayreplicate itself onto all the floppy disks that are read or written in that computer untilthe virus is eradicated.V — volt — The measurement of electric potential or electromotive force. One Vappears across a resistance of 1 ohm when a current of 1 ampere flows through thatresistance.WW — watt — The measurement of electrical power. One W is 1 ampere of currentflowing at 1 volt.WHr — watt-hour — A unit of measure commonly used to indicate the approximatecapacity of a battery. For example, a 66-WHr battery can supply 66 W of power for1 hour or 33 W for 2 hours.wallpaper — The background pattern or picture on the Windows desktop. Changeyour wallpaper through the Windows Control Panel. You can also scan in your favoritepicture and make it wallpaper.WLAN — wireless local area network. A series of interconnected computers thatcommunicate with each other over the air waves using access points or wireless routersto provide Internet access.write-protected — Files or media that cannot be changed. Use write-protection whenyou want to protect data from being changed or destroyed. To write-protect a 3.5-inchfloppy disk, slide its write-protect tab to the open position.WPAN — wireless personal area network. A computer network used for communica-tion among computer devices (including telephones and personal digital assistants)close to one person.WWAN — wireless wide area network. A wireless high-speed data network usingcellular technology and covering a much larger geographic area than WLAN. Alsoknow as Mobile Broadband network.
