I have known about this for a LONG time. We messed around and printed funny messages to other school districts. Yeah when you hold down ctrl and C...or Ctrl then the apple key as we called it and C it would stop loading all non essential programs pretty much...including the security system(which at the time was called OnGuard). However you were not on the network as the tcp/ip protocol is not loaded. Well after that you just toss the file that makes the security system boot up in the trashcan and reboot...now you are on the network with no security system in place. You can then make administrator accounts and so on. Then after your all done you toss the security boot file back in its original place and reboot. Now everything is back the way you found it.