I am looking into using this client side XML store built into IE 5.5 as a major part of a web application. It will help to solve one of the major problems we currently face, persistence of client side data without passing it all back to the web server(or using the overhead of session variables). The new UserData behavior attached as a style attribute seems to be a relatively new and untested technology. I was wondering if anyone out there has had extensive experience with its use, any bugginess noticed, etc.<BR><BR>I was also wondering if anyone knew what happens once the 64K limit per page or the 640K limit per session was used up? Is there a way to measure how much of the limit you have used up?