`>Computer and
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`Internet lerms
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`Dictionary of
`Computer and
`Internet Terms
`
`Tenth Edition
`
`Douglas A. Downing, Ph.D.
`School of Business and Economics
`Seattle Pacific University
`
`Michael A. Covington, Ph.D.
`Artificial Intelligence Center
`The University of Georgia
`
`Melody Mauldin Covington
`Covington Innovations
`Athens, Georgia
`
`Catherine Anne Covington
`Covington Innovations
`Athens, Georgia
`
`With the assistance of
`Sharon Covington
`
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`ABOUT THE AUTHORS
`
`Douglas Downing teaches economics and quantitative methods at the School of
`Business and Economics at Seattle Pacific University. He is the author of several
`books in both Barron’s Easy Way and Business Review series. He is also the author
`of Java Programming the Easy Way and Dictionary of Mathematics Terms, published
`by Barron’s Educational Series, Inc. He holds the Ph.D. degree in economics from
`Yale University.
`Michael Covington is Associate Director of the Artificial Intelligence Institute at
`the University of Georgia. He is the author of several books and over 250 magazine
`articles. He holds the Ph.D. degree in linguistics from Yale University.
`Melody Mauldin Covington is a graphic designer living in Athens, Georgia. She
`is the author of Dictionary of Desktop Publishing (published by Barron’s).
`Catherine Anne Covington is a student at the Lamar Dodd School of Art
`(University of Georgia).
`Sharon Covington is a student at Emory University.
`
`© Copyright 2009, 2006, 2003, 2000, 1998, 1996, 1995, 1992, 1989,
`and 1986 by Barron’s Educational Series, Inc.
`
`All rights reserved.
`No part of this book may be reproduced or distributed in
`any form or by any means without the written permission
`of the copyright owner.
`
`All inquiries should be addressed to:
`Barron’s Educational Series, Inc.
`250 Wireless Boulevard
`Hauppauge, NY 11788
`www.barronseduc.com
`ISBN-13: 978-0-7641-4105-8
`ISBN-10: 0-7641-4105-8
`
`Library of Congress Catalog Card No. 2008044365
`
`Library of Congress Cataloging-in-Publication Data
`Downing, Douglas.
`Dictionary of computer and Internet terms / Douglas A. Downing,
`Michael A. Covington, Melody Mauldin Covington. — 10th ed.
`p. cm.
`ISBN 978-0-7641-4105-8
`1. Computers—Dictionaries. 2. Internet—Dictionaries. I. Covington,
`Michael A., 1957– II. Covington, Melody Mauldin. III. Title.
`
`QA76.15.D667 2009
`004.03—dc22
`
`PRINTED IN CHINA
`9 8 7 6 5 4 3 2 1
`
`2008044365
`
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`7_4105_DO_CompInternetTerms_T 12/29/08 10:38 AM Page 484
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`touchpad
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`484
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`FIGURE 269. Topologies of computer networks
`
`touchpad a substitute for a MOUSE on a laptop or notebook computer
`(Figure 270). The user uses a finger to make strokes on a rectangular
`touch sensor. Just as with a mouse, the direction and length of the strokes
`is significant, but not their absolute position.
`
`FIGURE 270. Touchpad (on a laptop computer).
`
`touchscreen a computer screen that is sensitive to touch, so that the user
`can point to things on it by touching the screen itself, without using a
`mouse.
`
`trace
`1. to execute a program step by step, observing the results of each step.
`2. (in a draw program) to create a path or outline around the contours of
`a bitmapped shape. It is necessary to trace bitmaps to convert them into
`VECTOR GRAPHICS. Tracing can be done by a separate utility program or
`from within the drawing program.
`
`track
`1. one of the concentric circles in which data is recorded on a disk (Figure
`271), or one of the parallel strips in which data is recorded on tape.
`2. a music selection on a CD-ROM.
`3. a video selection on a DVD.
`4. a portion of a MIDI file that specifies the performance details of a sin-
`gle instrument.
`
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