MyBB XML HTTP Requests?

[Firefox Wins]

There is no documentation in the MyBB wiki, and almost nothing in the forum about MyBB's xmlhttp.php.

Code:

* It contains a stripped down version of the MyBB core which does not load things * such as themes, who's online data, all of the language packs and more. * * This is done to make response times when using XML HTTP Requests faster and * less intense on the server.

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Does anyone have a small code sample for usage, or a link?
What exactly?
Anything, just a starting point.
Thanks


EDIT:
This (xmlhttp.php) obviously requires the user to have javascript enabled, does MyBB have any type of xmlrpc API or services built in?