Best way to capture screen stuff and get it onto dvd

[adams]

Sorry for the long title but I couldn't think how to make it shorter. So here is what I'm needed to do.

I need to be able to record whatever is going on, on the computer screen and export it to vhs or dvd. Now I also need sound too and it would be nice if I can get it done in one process.

I'm aware of products like snagit and camstudio, but do either of them offer sound input?

Now to make it even more complicated this will be setup in a classroom setting where the instructor will have to control this setup, so preferrably it needs to be something really simple like push the on button and be good to go.

Anyway we can do something like this?