How can I pause the Eye Tracking and then un pause again?

You can "pause" the Eye Tracking by looking below the screen of the MyTobii unit. Doing so will bring up a menu that let´s you choose to "pause" the Eye Tracking. Use the same method for starting the Eye Tracking again. If you have a USB keyboard attached to the device the "pause" button on the keyboard can also be used with the same result.