I don't think so. I have a feeling that what you want here is not AJAX but COMET (en.wikipedia.org/wiki/Comet_%28programming%29).
Neither with jQuery? :/
That's a really nice feature but isn't what i'm looking for.... yet.
Yes, content will be returned, but the XHR object's readyState will not be set to 4, so if you are relying on that to update your div (which most JS libraries' AJAX auto updaters do), you won't see it automatically.