Ajax native support in IE7
“IE 7 implements a native XMLHTTPRequest object for Javascript applications, instead of requiring an ActiveXObject to be created. This also means XMLHTTPRequest will function on machines that have ActiveX disabled.”
http://blogs.msdn.com/ie/archive/2005/09/13/465338.aspx
XMLHttpRequest will be a native object in IE7, meaning it will work even when ActiveX support has been disabled in the browser for security reasons. This brings the browser’s support for remote scripting—the technology at the heart of AJAX applications—up to the same standard as that offered by Firefox, Safari, Opera, and similar browsers.
