Is there a way of doing this? He's had a problem with obsessive gaming which has led to his schoolwork suffering. The trouble is he needs the computer to do his schoolwork so I can't just disconnect it or shut off the wifi. Also, because the computer's in his room, where he spends most of his time with the door shut because he's in surly teenager phase, I've got no way of keeping tabs on whether he's actually doing his schoolwork or gaming.