Information Technology Reference
In-Depth Information
12.1
MacBook Air sometimes locks preferences to avoid unauthorized changes.
To enable the controls, click the lock icon in the bottom-left corner of the window and then type the username
and password of an administrator account.
You Can't Install a Downloaded Program
When you download an application and try to install it, you might run smack up against the dialog shown in
Figure 12.2.
12.2
By default, OS X Mountain Lion prevents you from installing apps from unidentified developers.
