Operating instructions

level 3 (L3) cache The third RAM cache accessed by the CPU, which is much
larger and slower than the L1 and L2 cache; accessed only if the requested
program/data is not in the L2 cache. Seen only on high-end CPUs.
Li-Ion (lithium ion) A type of battery commonly used in portable PCs. Li-Ion
batteries don’t suffer from the memory effects of NiCd batteries and provide
much more power for a great length of time.
limited account A type of user account in Windows XP that has limited
access to a system. Accounts of this type cannot alter system files, cannot install
new programs, and cannot edit settings using the Control Panel.
Linux Open source UNIX-clone operating system.
local bus A high-speed data path that directly links the computer’s CPU with
one or more slots on the expansion bus. This direct link means signals from an
adapter do not have to travel through the computer expansion bus, which is sig-
nificantly slower.
localhost An alias for the loopback address of 127.0.0.1, referring to the cur-
rent machine.
logical address An address that describes both a specific network and a spe-
cific machine on that network.
logical drives Sections of a hard drive that are formatted and assigned a drive
letter, each of which is presented to the user as if it were a separate drive.
loopback address A reserved IP address for internal testing: 127.0.0.1.
low-level format Defining the physical location of magnetic tracks and sec
-
tors on a disk.
LPT port Commonly referred to as a printer port; usually associated with a
local parallel port.
lumens A unit of measure for the amount of brightness on a projector or
other light source.
luminescence The part of the video signal that controls the luminance/
brightness of the picture. Also known as the “Y”portion of the component signal.
40 MIKE MEYERS’ A+ CERTIFICATION PASSPORT
Passport / Mike Meyers‘ A+ Certification Passport / Meyers / 226308-3 / Glossary
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Monday, April 09, 2007 10:24:44 PM
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