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`Copyright © 2001 by Houghton Mifflin Company.
`All rights reserved.
`
`No part of this work may be reproduced or transmitted in any form or by
`any means, electronic or mechanical, including photocopying and record-
`ing, or by any information storage or retrieval system without the prior
`written permission of Houghton Mifflin Company unless such copying is
`expressly permitted by federal copyright law. Address inquiries to Reference
`Permissions, 222 Berkeley Street, Boston, Massachusetts 02116.
`
`Visit our website: www.houghtonmifflinbooks.com
`
`Library of Congress Cataloging-in-Publication Data
`
`Dictionary of computer and internet words : an A to Z guide to hardware,
`software, and cyberspace.
`
`p. cm.
`.
`.
`.
`ISBN 0-618-10137-3
`1. Computers—Dictionaries. 2. Internet-Dictionaries.
`QA76.15 .D5255 2.001
`004'.O3-—dc21
`
`2001016390
`
`Manufactured in the United States of America
`
`DOI—I10987654321
`
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`boot sector
`
`bomb n. An abrupt and Complete failure, especially of a running
`program.
`1/. To fail suddenly and completely. See also crash.
`
`bookmark A marker used in a program such as a web browser or a
`help utility that allows you to go directly to a specific webpage.
`
`Boolean expression An expression that yields a value of TRUE or
`FALSE. Boolean expressions can contain relational operators such
`
`as = for is equal to, < for is less than, and > for is greater than. For ex-
`
`ample, the statement 26 > 30 returns the value FALSE. The other
`main type of operator in Boolean expressions is a Boolean (some-
`times called logical) operator, such as AND, OR, NOT, NOR, or XOR.
`
`For example, if A is the statement Ice is cold (and we assume that the
`statement is true), the result of the expression NOT A is FALSE.
`
`Boolean logic A form of algebra that employs only two values, TRUE
`and FALSE. Boolean logic, developed by the 19th-century English
`mathematician George Boole, is particularly well suited for use with
`computers because it works so well with the binary number system.
`A bit with value 1 corresponds to TRUE; 0 bit with value 0 corre—
`
`sponds to FALSE. See also fuzzy logic,
`Boolean Operator An operator whose result can only be one of two
`values, TRUE or FALSE. Boolean operators are widely used in pro-
`gramming, spreadsheets, and databases. Common Boolean opera-
`tors are AND, OR, XOR, and NOT. For example, the database query
`
`find all where last_name = "Iones" AND balance_owed > 100
`
`would yield the records of everyone named Iones who owed more
`than $100. The query
`
`find all where last_name = "Jones” OR balance_owed > 100
`
`would yield the records of everyone named lanes regardless of the
`balance owed and the records of everyone who owed more than
`$100 regardless of last name. Also called logical operator.
`boot
`v. To load the software, usually the operating system, that starts
`
`the computer.
`1'1. The process of loading the software that starts the computer. See
`also cold boot, warm boot.
`
`boot disk See startup disk.
`boot sector A track on a disk containing the instructions that auto-
`matically run to begin the operation of the computer when the com-
`puter is turned on. Usually the boot sector is located on a hard
`drive’s first track in the first partition.
`
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