The Bottoms Up beer tap fills from underneath and it is supposed to produce less waste and be quicker than traditional taps. It works with a custom cup that has a metal rimmed hole at the bottom ...

2. In the Physical and Motor section, tap "Touch." 3. Scroll to the bottom and tap "Back Tap." 4. Tap either "Double Tap" or "Triple Tap," depending upon which gesture you want to configure.