IE7 Tabbed Browsing Annoyance Part 2

This is just a quick post. It concerns how IE7 (Internet Explorer 7 Beta 1) deals with XmlHttpRequest Object (commonly used for AJAX based applications) and multiple windows. If I construct a request in IE7 that is not asynchronous it naturally will stop the browser from responding until it is completed. In IE7, if you have multiple tabs open and perform a long XmlHttpRequest that is synchronous in nature, it stops all the other tabs from responding. I would expect that what it should do is to lock the current tab and nothing else? Is my thinking correct

Has anyone else experienced this? If so email me: paul.kinlan@gmail.com and I can write a bit more about it.