Starting Up, Logging In, and Sleeping
The Safari-only guest mode is new to OS X Mountain Lion. If you don't set up a Guest account in the Users & Groups system preference (see Chapter 25), guests can still use your Mac to access a secured copy Safari that has no access to your bookmarks or other Safari information, nor to your Mac's disks and other information.
OS X Mountain Lion sleeps a little differently than previous versions of OS X. Using a technology Apple calls Power Nap, a sleeping Mac will install updates from the Mac App Store (see Chapter 7), back up via Time Machine (see Chapter 32), sync photos and other iCloud content (see Chapter 22), and log notifications (see Chapter 12) while sleeping. This feature is available only on MacBook Airs released in 2011 and later, and MacBook Pros released in 2012 and later.
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