Synaptic Touchpad -

Use two fingers to scroll vertically or horizontally through documents and web pages.

Pinch or stretch with two fingers to zoom in and out of images and maps. Synaptic Touchpad

The is critical software that allows the operating system to communicate effectively with the touchpad hardware. Without it, the touchpad may only function as a basic "PS/2 Compatible Mouse," losing all multi-touch gestures and specialized settings. Use two fingers to scroll vertically or horizontally