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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:
- From the Apple menu, select System Preferences... .
- From the View menu, select Accounts.
- In Mac OS X 10.5.x, 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 10.3.x and 10.4.x, 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... .
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