Como trancar o ecrã

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Locking your screen

Mac OS X also allows you to lock your screen when the screen saver becomes active. You will then have to enter your password to regain access to your computer. To activate this feature:

From the Apple menu, select System Preferences... .

From the View menu, select Security.

Check the box next to Require password to wake this computer from sleep or screen saver.
To add an item to your menu bar that will allow you to quickly lock the screen and turn on the screen saver:

From your Applications folder, open your Utilities folder, and then open Keychain Access.

In 10.4 and 10.5, from the Keychain Access menu, select Preferences... . Under the General tab, check the box next to Show Status in Menu Bar.
In 10.3, from the View menu, select Show Status in Menu Bar to check it.

The padlock icon will appear in your menu bar in the upper right corner of your screen. To lock your screen, click this icon, and from the menu that appears, select Lock Screen.