Chapter 8 from The WorldWideWeb Handbook by Peter Flynn. Reprinted with permission of International Thomson Computer Press. Copyright © 1995 International Thomson Computer Press, A division of International Thomson Publishing. All rights reserved. No part of this excerpt nor the whole which is copyright may be reproduced or used in any form or by any means--graphic, electronic, or mechanical, including photocopying, recording, taping or information storage and retrieval systems--without the written permission of the Publisher, except in accordance with the provisions of the Copyright Designs and Patents Act 1988.