The Macbook Air is a thin yet powerful laptop that is great for Mac users who wants to take their work with them at all times. You will love it!
Guest logins is a convenient and secure way of letting friends (or strangers) use your Mac without letting them access your personal files.
The purpose of screensavers is to keep your screen from aging prematurely. As an added bonus, it makes your Mac look gorgeous when not used.
Sometimes, even the best of apps get stuck and won't quit, no matter how hard you try. Don't worry, you can always force quit applications.