my school has a mac network with probably 200+ macs. in one of my classes we use laptops to do work. theres this really annoying kid who uses the screen share to partially control other laptops across the room. everyone uses a "student" account so the server don't get backed up. so the perve can connect to anyone using a laptop and see what we're doing. i tried connecting to his but it said authentication failed, even with the right credentials. apperently, it only works on some machines. does anyone know how i can connect to him and disable screen sharing?