Operating instructions

VRR (vertical refresh rate) A measurement of the amount of time it takes for
a CRT to draw a complete screen. This value is measured in hertz, or cycles per
second. Most modern CRTs have a VRR of 60 Hz or better.
VxD (virtual device driver) A special type of driver file used to support older
Windows programs. Windows protection errors take place when VxDs fail to
load or unload. This usually occurs when a device somehow gets a device driver
in both CONFIG.SYS and SYSTEM.INI or the Registry.
WAN (wide area network) A geographically dispersed network created by
linking various computers and local area networks over long distances, gener
-
ally using leased phone lines. There is no firm dividing line between a WAN and
a LAN.
warm boot A system restart performed after the system has been powered
and operating. This clears and resets the memory,but does not stop and start the
hard drive.
wattage (watts or W) The amount of amps and volts needed by a particular
device to function is expressed as how much wattage (watts or W) that device
needs.
WAV (Windows Audio Format) The default sound format for Windows.
wave table synthesis A technique that supplanted FM synthesis, wherein re-
cordings of actual instruments or other sounds are embedded in the sound card
as WAV files. When a particular note from a particular instrument or voice is re
-
quested, the sound processor grabs the appropriate prerecorded WAV file from
its memory and adjusts it to match the specific sound and timing requested.
wildcard A character used during a search to represent search criteria. For
instance, searching for “*.doc” will return a list of all files with a .doc exten
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sion, regardless of the filename. “*” is the wildcard in that search.
Windows 2000 The Windows version that succeeded Windows NT; it came in
both Professional and Server versions.
Windows 9x A term used collectively for Windows 95, Windows 98, and
Windows Me.
72 MIKE MEYERS’ A+ CERTIFICATION PASSPORT
Passport / Mike Meyers‘ A+ Certification Passport / Meyers / 226308-3 / Glossary
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