The XDomainRequest object is implemented in Internet Explorer 8–10 and can be used to do cross-domain asynchronous requests and it also has support for streaming the content.
The XDomainRequest object was implemented in IE8 and can be used to do cross-domain asynchronous requests. It also has support for streaming the content.
Eric Law has explained its use in an IEInternals blog post: COMET Streaming in Internet Explorer