In Mac OS X, how do I password-protect my computer?

Because Mac OS X is based on Unix, the operating system has native support for a password-protected multiple-user environment. By default, you are required to set a single user with a password. If you have only one user created, your computer will not prompt for a user password when your computer starts. However, you may secure your computer with a password as follows:

1. From the Apple menu, select System Preferences... .
   
   
2. From the View menu, select Accounts.
   
   
3. In Mac OS X 10.6 and 10.5, at the bottom of the left panel, click Login Options. In the right panel next to "Automatic login:", select Disabled from the pull-down menu. If the Login Options are grayed out, click the padlock icon in the bottom of the preference window and authenticate to your account.

   In Mac OS X 10.4 and 10.3, at the bottom of the left panel, click Login Options, and in the right panel, uncheck Automatically log in as: . If the Login Options are grayed out, click the padlock icon in the bottom of the preference window and authenticate to your account.

When starting your computer, you will have to authenticate to access your account. You may also log out of your computer without restarting. From the Apple menu, select Log out... .

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:

1. From the Apple menu, select System Preferences... .
   
   
2. From the View menu, select Security.
   
   
3. In 10.6, check Require password... after sleep or screen saver begins, and choose how long the computer can be asleep or the screen saver on before a password is required.

   In 10.5 or 10.4, check 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:

1. From your Applications folder, open your Utilities folder, and then open Keychain Access.
   
   
2. From the Keychain Access menu, select Preferences... . Under the General tab, check Show Status in Menu Bar.
   
   
3. 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.

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