Hello,
On some Compony-PC`s ActiveX and some other stuff is disabled.
To maximize the compatiblity to IE6 and other Browsers - it would be Nice to implement a additional way for the httprequest.
Here is an Example
XMLHttpRequest in Internet Explorer without ActiveX Controls - Michael's Blog (http://weblogs.asp.net/mschwarz/archive/2005/08/24/423495.aspx)
I think this should only be a fallback feature if the browser doesn`t support nativ requests or hasn`t ActiveX-Addin installed.