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Operating instructions

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code A set of symbols representing characters (e.g., ASCII code) or instruc
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tions in a computer program (a programmer writes source code, which must be
translated into executable or machine code for the computer to use). Used collo
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quially as a verb, to code is to write computer code; and as a noun, “He writes
clean/sloppy/bad code.”
codec (compressor/decompressor) Software that compresses or decom
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presses media streams.
collision The result of two nodes transmitting at the same time on a multiple
access network such as Ethernet. Both packets may be lost, or partial packets
may result.
collision domain A set of Ethernet segments that receive all traffic generated
by any node within those segments. Repeaters, amplifiers, and hubs do not
create separate collision domains, but bridges, routers, and switches do.
COM port(s) A system name that refers to the serial communications ports
available on your computer. When used as a program extension, .COM indi-
cates an executable program file limited to 64 KB.
command A request, typed from a terminal or embedded in a file, to perform
an operation or to execute a particular program.
command processor The part of the operating system that accepts input
from the user and displays any messages, such as confirmation and error
messages.
command prompt A text prompt for entering commands.
command-line interface A user interface for an OS devoid of all graphical
trappings; interfaces directly with the OS.
communications program A program that makes a computer act as a termi
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nal to another computer. Communications programs usually provide for file
transfer between microcomputers and mainframes.
CompactFlash (CF) One of the older but still popular flash media formats. Its
interface uses a simplified PC Card bus, so it also supports I/O devices.
component failure Occurs when a system device fails due to manufacturing
or some other type of defect.
Passport / Mike Meyers‘ A+ Certification Passport / Meyers / 226308-3 / Glossary
16 MIKE MEYERS’ A+ CERTIFICATION PASSPORT
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