As mentioned earlier, you can do a lot more with an application like this. The example is not a perfect application, but it will give you enough to get you moving in the right direction. For example, you could extend it to a lobby application to handle multiple classes simultaneously.
That sums it up for the tutorials for this book. Remember, all applications developed in this book are available online on the book's web site (http://flashcom.PangaeaNewMedia.ca/). Watch this site and the Designer Developer center on Macromedia.com (http://www.macromedia.com/desdev/mx/flashcom/) for additional tutorials from me, as well.
The book's appendixes contain five quick reference guides giving you a summary of ActionScript objects for the server, Flash, and the UI components. Be sure to review Appendix E,"Useful ActionScript Templates Quick Reference," for some very handy code snippets.