MyBB XML HTTP Requests?

[ZiNgA BuRgA]

(02-06-2011 01:59 AM)Firefox Wins Wrote:  does MyBB have any type of xmlrpc API or services built in?  

Nope.

I'm not sure what you mean by "how to use it".
The link your provided refers to Javascript to perform AJAX requests, whereas xmlhttp.php is the PHP script which handles them.  MyBB uses the prototype library for AJAX requests (instead of directly interfacing with the browser API).