You'll find the answer to this question and many others in the Wrox FAQ at:
http://p2p.wrox.com/topic.asp?TOPIC_ID=268
My Wrox book has exercises and states the answers to them are available online. Where are they?
These exercise answers are in a database that became corrupt before we gained access to it. We are attempting to recover those answers from the database or other sources and make them available again soon. We will update this answer as soon as they are available.
Other Wrox FAQs specific to the P2P forums are also available at:
http://p2p.wrox.com/topic.asp?TOPIC_ID=278
Jim Minatel
Senior Acquisitions Editor
Wiley Technology Publishing
WROX Press