Library of Congress Cataloging-in-Publication Data Welch, Brent. B. Practical programming in Tcl and Tk / Brent B. Welch.-- 3rd ed. p. cm. ISBN 0-13-022028-0 1. Tcl (Computer program language) 2. Tk toolkit. I. Title. QA76.73.T44 W45 1999 005.13'3--dc21 99-047206 Credits Editorial/Production Supervision: Joan L. McNamara Acquisitions Editor: Mark Taub Marketing Manager: Kate Hargett Editorial Assistant: Michael Fredette Cover Design Director: Jerry Votta Cover Design: Design Source Manufacturing Manager: Alexis R. Heydt © 2000, 1997 by Prentice Hall PTR Prentice-Hall, Inc. Upper Saddle River, New Jersey 07458 Prentice Hall books are widely used by corporations and government agencies for training, marketing, and resale. The publisher offers discounts on this book when ordered in bulk quantities. For more information, contact: Corporate Sales Department, Prentice Hall PTR, One Lake Street, Upper Saddle River, NJ 07458 Phone: 800-382-3419; Fax: 201-236-7141; email: corpsales@prenhall.com All rights reserved. No part of this book may be reproduced, in any form or by any means, without permission in writing from the publisher. All product names mentioned herein are the trademarks of their respective owners. Printed in the United States of America 10 9 8 7 6 5 4 3 2 1 Prentice-Hall International (UK) Limited, London Prentice-Hall of Australia Pty. Limited, Sydney Prentice-Hall Canada Inc., Toronto Prentice-Hall Hispanoamericana, S.A., Mexico Prentice-Hall of India Private Limited, New Delhi Prentice-Hall of Japan, Inc., Tokyo Prentice-Hall (Singapore) Pte. Ltd., Singapore Editora Prentice-Hall do Brasil, Ltda., Rio de Janeiro Dedicationto Jody, Christopher, Daniel, and Michael |