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U
Uninterruptible Power Supply (UPS): A device connected between a piece of electrical
equipment, such as a computer system, and the AC power source to protect
against transient power conditions and short-term power outages. A UPS unit
contains a power-level sensor and a battery. If the sensor detects a loss of
power, it switches over to the battery giving you time to save data and close
down the system.
upload: To send a file to another computer through a modem. See also download.
utility: A computer program that lets you modify how certain aspects of your computer
function. Utilities differ from applications because you don't use them to do real
work—they just make your life easier. Different utilities manage fonts,
compress files and check for viruses.
V
volatile memory: Random Access Memory (RAM) that is capable of storing information
only as long as the computer is turned on.
W
Wake-on-LAN (WOL): The Wake-on-LAN function turns on the server when the client PC
sends the necessary code.
warm boot: Restarting the computer without turning it off. See also boot, restart.
.WAV file: Digital audio uses computer-based technology to record, handle and recreate
sound. Digital audio systems sample the waveform at fixed time intervals and
reduce the sound to a sequence of numbers. When you play back a digital
waveform or.WAV file, the software transforms the numeric data back into its
original acoustic waveform.
window: A portion of the screen that can display its own application or document.
wizard: A helpful online tutor that guides you through common procedures or processes,
as in hardware wizard.
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