VoiceOver is an alternate interface for Mac OS X for people with visual disabilities and others who need to hear what’s on the screen. VoiceOver describes aloud what appears on the screen, and speaks the text in documents and windows. Using VoiceOver, you control the computer primarily with the keyboard instead of the mouse. You also use the VoiceOver cursor to move around the screen and hear descriptions of items, as well as to activate buttons and controls, and to read and edit text.

For more information about VoiceOver, open it and choose Help > VoiceOver Help. If VoiceOver is already open, press Control-Option-question mark (?).