Simple database; xml?

What I’m trying to do is keep track of responses to several questions. In other words what I have is sort of like a quiz. Each question has a yes or no button and what I’d like to do is update a number in, say, an xml file in order to keep track of how many people clicked “Yes” and “No” and “Total”. Any idea if there are any relatively simple tutorials that might explain how to do this? After the Flash file has been up a while, we want to see how a large number of people answered the questions and put up a chart.

I have a good bit of experience accessing xml files to drive a Flash file, but I haven’t yet gone the other way where the Flash file communicates with an xml file and updates the xml itself. As always I will be forever grateful for any suggestions on how to learn this. I’m not finding much “out there” just looking on my own.