I'm using my brother's new MacBook and it's not letting me log out of the guest account. The only options I see are Restart and Shut Down. How can I log out of the guest account?

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    What happens if you just try pressing Shift+Command+Q? – Arc676 Dec 27 '15 at 5:49
  • If you can open Terminal, try typing sudo killall WindowServer to kill WindowServer and force log out all graphical users. – CyberSkull Dec 27 '15 at 10:06
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    @CyberSkull I don't know of any guest account entitled to sudo. That would render any security measure useless! – klanomath Dec 27 '15 at 12:49
  • @klanomath it's been a long time since I used guest, but as I recall it did have Terminal access. – CyberSkull Dec 27 '15 at 12:51
  • @CyberSkull But you can't sudo with the guest account. In the default OS X setup only members of the admin group can sudo. – klanomath Dec 27 '15 at 12:52

If you're not positive that your bro has Guest Account access set up, OS X introduced a new feature related to 'Find My Mac' that creates a sandboxed fake Guest Account in order to make it easier to recover your mac in case it gets stolen, luring the thief to go and connect to some random Wi-Fi with the guest account.

Maybe that's what's going on, you could easily restart and login to any account you like though.

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