Hi, I need a bit of help with MacBook security for school laptops. The first issue is Single User Mode. It is disable via firmware BUT students are able to take a stick of memory out of the laptop, and then they can boot into it. How can we stop this? The second issue is students watching movies, etc, in class, they do this by turning off the airport. We fixed that, but now they go "Join Other Network", they type in gibberish, and it disconnects. No longer can we watch them. How can we make it so it attempts to re-connect to a certain network if it is disconnected like that? Much thanks!