may the force be with you

I rarely read an entire article about a single object, especially one that is this simple. However, you will use this object over and over again in each page and application that you write that uses Ajax. This article shows you how to create XMLHttpRequest instances in a cross-browser way, construct and send requests, and respond to the server.

source:http://developers.slashdot.org/article.pl?sid=06/01/22/1440258