Dell Latitude X1 - Manual (Page 42)

l To double-click an object, position the cursor on the object and tap twice on the touch pad or use your thumb to press the left touch-pad button twice.
Customizing the Touch Pad
You can use the Mouse Properties window to disable the touch pad or adjust their settings.
1. Open the Control Panel , and then click Mouse.
2. In the Mouse Properties window:
l Click the Device Settings tab, and then click Disable to disable the touch pad.
l Click the Pointers tab to adjust touch pad settings.
3. Click OK to save the settings and close the window.