So how do you code an AJAX Web page?

So how do you code an AJAX Web page?: "August 03, 2006 (Computerworld) -- This article is excerpted from the soon-to-be-published book AJAX: Creating Web Pages with Asynchronous JavaScript and XML by Edmond Woychowsky, copyright Pearson Education Inc. Reprinted with permission from Pearson Education, all rights reserved. The book is part of the Bruce Perens’ Open Source Series."