To use 4 finger gestures in TouchPad, you need to enable exposé on your computer and map F keys to those gestures.
1. Open System Preferences and click on Exposé & Spaces

2. Select the Exposé tab. Then select shortcut F keys for Exposé.

3. Open TouchPad and open the Connection Manager view. Tap on Settings.

4. Tap on one of the 4 finger gesture to select which shortcut key is associated with the gesture.
