If you're using a Multi-Touch trackpad, you can use VoiceOver gestures. VoiceOver provides a set of standard gestures for navigating and interacting with items on the screen. You can't modify this set of gestures. NOTE: Gestures that don't mention a specific number of fingers are single-finger gestures.
General
Enable the Trackpad Commander and VoiceOver gestures: VO-Two-finger rotate clockwise
Disable the Trackpad Commander and VoiceOver gestures: VO-Two-finger rotate counterclockwise
Turn the screen curtain on or off: Three-finger triple-tap
Mute or unmute VoiceOver: Three-finger double-tap
Navigation
Force the VoiceOver cursor into a horizontal or vertical line when you drag a finger across the trackpad: Hold down the Shift key and drag a finger horizontally or vertically
Move the VoiceOver cursor to the next item: Flick right
Move the VoiceOver cursor to the previous item: Flick left