For Authentic8 Silo iPad version 3.0 (released June 21, 2013):

  1. Two finger tap to show or hide the keyboard 
  2. Two finger swipe for page manipulation 
    Up -> Open new page
    Down -> Close page  
    Left -> Back, previous page  
    Right -> Forward, next page 
  3. Common actions 
    One finger drag to scroll 
    One finger hold-drag to drag
    One finger tap-hold to bring up context menu