Glossary of Computer Terms—L
L
LANDSCAPE: A printer
feature, generally controlled by software, which rotates the output image by
90º to print across the length rather than the width of the paper.
LAPTOP AND
NOTEBOOK: Small, lightweight, portable battery-powered
computers that can fit onto your lap. They each have a thin, flat, liquid
crystal display screen.
LASER (LIGHT
AMPLIFICATION by STIMULATED EMISSION of RADIATION): A system that
generates high-intensity, highly-focused light for many purposes, including
printers, high-density memory media, and a light generator for fiber optic
transmission systems.
LASER DISK: See CD-ROM
LASER PRINTER: A
computer-driven photocopier that creates an original image of the text or
graphics from the output of the computer. A computercontrolled laser beam
“paints” the desired image inside the photocopier and then prints the image on
a sheet of paper.
LEASED LINE: A leased phone
line that provides a full-time, dedicated, direct connection to the Internet.
LIBRARY: A collection of
standard software instructions, programs, routines, and subroutines in a
computer’s memory.
LIGHT PEN: A
light-sensitive stylus for forming graphics by touching coordinates on a display
screen, thereby seeming to draw directly on the screen.
LINK: See hyperlink.
LINKAGE: Instructions
that connect one program to another, providing continuity of executions between
the programs.
LINUX: A UNIX like,
open-source operating system developed primarily by Linus Torvalds. Linux is
free and runs on many platforms, including both PCs and Macintoshes.
LIST SERVE: An Internet
application that automatically “serves” mailing lists by sending electronic
newsletters to a stored database of Internet user addresses. Users can handle
their own subscribe/unsubscribe actions without requiring anyone at the server
location to personally handle the transaction.
LIVE SCRIPT: This is the
former name of Java Script. There are few updates between the two.
LOCAL AREA
NETWORK (LAN): A combined hardware/software technique for
interconnecting company related multiple computers or computer terminals
through a high-speed networking system.
LOGIC GATE: A digital
circuit resulting in an output whose state (0 or 1) depends on the specific
combination of the states of input signals. Definitions of the more commonly
used logic gates are listed below:
AND: All inputs must be in a “1”
state to produce a “1” state output.
NAND (NOT AND): All inputs must be in a “1” state to produce a “0” state
output.
NOR (NOT OR): Any one input, or more, in a “1” state will produce a “0”
state output.
NOT (INVERTER): A logic gate having only one input and one output. If the
input is in a “1” state, the output is in a “0” state and vice versa.
OR: Any one input, or more, in a “1” state will produce a “1”
state at the output.
XOR (EXCLUSIVE OR): If any of the
inputs are in a “1” state, but not if two or more inputs are “1”, the output is
in a “1” state.
LOOK AHEAD: 1. A feature of
a CPU which allows the masking of an interrupt request until the current
sequential instruction has been completed.
2. A feature of an adder circuit in the ALU section which
allows the circuit to look ahead to see that all the generated arithmetic
carrys are available for addition.
LOOPING: The repetition
of program instructions until a conditional exit situation is encountered.
LOGIN: To attach to a
computer. It has also come to represent your User ID command.
LOGIN SCRIPT: This is the small text file that is run by the server gateway to make the attachment between it and your computer.
LOGIN SCRIPT: This is the small text file that is run by the server gateway to make the attachment between it and your computer.
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