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Glossary 211
utility
A program used to manage system resources—
memory, disk drives, or printers, for example.
UTP
Abbreviation for unshielded twisted pair.
UUID
Acronym for Universal Unique Identification.
V
Abbreviation for volt(s).
VAC
Abbreviation for volt(s) alternating current.
varbind
An algorithm used to assign an object identifier or OID.
The varbind gives rules for arriving at the decimal prefix
that uniquely identifies an enterprise, as well as the
formula for specifying a unique identifier for the
objects defined in that enterprise's MIB.
variable
A component of a managed object. A temperature
probe, for example, has a variable to describe its
capabilities, its health or status, and certain indexes
that you can use to help you in locating the right
temperature probe.
VCCI
Abbreviation for Voluntary Control Council for
Interference.
VCR
Abbreviation for video cassette recorder.
VDC
Abbreviation for volt(s) direct current.
VESA
Acronym for Video Electronics Standards Association.
VGA
Abbreviation for video graphics array. VGA and SVGA are
video standards for video adapters with greater resolution
and color display capabilities than previous standards. To
display a program at a specific resolution, you must install
the appropriate video drivers and your monitor must
support the resolution. Similarly, the number of colors
that a program can display depends on the capabilities of
the monitor, the video driver, and the amount of video
memory installed for the video adapter.
VGA feature connector
On some systems with a built-in VGA video adapter, a
VGA feature connector allows you to add an
enhancement adapter, such as a video accelerator, to
your computer. A VGA feature connector can also be
called a
VGA pass-through connector
.
video adapter
The logical circuitry that provides—in combination
with the monitor—your computer's video capabilities.
A video adapter may support more or fewer features
than a specific monitor offers. Typically, a video
adapter comes with video drivers for displaying popular
application programs and operating systems in a variety
of video modes.
On some Dell computers, a video adapter is integrated
into the system board. Also available are many video
adapter cards that plug into an expansion-card connector.
Video adapters often include memory separate from
RAM on the system board. The amount of video
memory, along with the adapter's video drivers, may
affect the number of colors that can be simultaneously
displayed. Video adapters can also include their own
coprocessor for faster graphics rendering.
video driver
A program that allows graphics-mode application
programs and operating systems to display at a chosen
resolution with the desired number of colors. A
software package may include some “generic” video
drivers. Any additional video drivers may need to match
the video adapter installed in the computer.