Didn't know where to place this, but can someone tell me exactly how the warranty works with one of these?

I know you get the remainder of the 4 year/50,000 mile warranty + a 2 year/100,000 mile warranty as well.

I bought a 2006 A6 3.2 CPO, and it was first purchased March 8, 2006. All warranty's put together, my warranty expires March 8, 2012.

What exactly do I get out of the warranty?

Thanks in advance!