My son has recently figured out that by holding "command" "s" on the keyboard while the computer is starting up you can create a whole new administrator account and then proceed to bypass all of the parental controls I have installed. I'd really like to be able to have a step by step process on how to disable single user mode so u can no longer access it by holding command s. I don't have the startup disk so I can't put a firmware password on it so if there is another way could someone please let me know, I have mac os 10.6.8 snow leopard and have found methods on disabling single user mode on earlier versions but not this one. I know it is probably not a good idea to disable but honestly I don't care I'm more concerned that my children can browse whatever they want. Please advise.