How to disable the guest account via the GUI?

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http://askubuntu.com – I know you can edit a configuration file to disable the guest account, but is there any option to do that via the Ubuntu 12.10's GUI? It's hard for me to believe that a simple on/off option wasn't implemented since the guest account was added to Ubuntu, and I'd be glad to find that option added as a feature to the 12.10 release. (HowTos)