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Because Mac OS X is based on Unix, it providesnative support for a password-protected, multiple-user environment. Bydefault, you are required to create a single user account with apassword. If you have only one user account created, your computerwill not prompt you for a password when your computer starts. However,you may secure your computer with a password as follows:
In Mac OS X 10.4 and 10.3, at the bottom of the left panel, clickLogin Options, and in the right panel, uncheckAutomatically log in as:. If Login Options isgrayed out, click the padlock icon in the bottom of the preferencewindow, and then authenticate to log into your account.
When starting your computer, you will have to authenticate to accessyour account. You may also log out of your computer withoutrestarting. From the Apple menu, select Log out....
Mac OS X also allows you to lock your screen when the screen saverbecomes active. You will then have to enter your password to regainaccess to your computer. To activate this feature:
In 10.5 or 10.4, check Require password to wake this computer fromsleep or screen saver.
To add an item to your menu bar that allows you to quickly lockthe screen and turn on the screen saver:
Applications
folder, open yourUtilities
folder, and then open Keychain Access
.