things to clear up

• 6-1 code. How about touch enabled DnD?
  • http://stackoverflow.com/questions/5186441/javascript-drag-and-drop-for-touch-devices
• Code trick where you (-) your own object. Check processing book.
  • From the Arduino Book. Mutual Exclusivity
  • Later, we read the current state of the button, and if it’s pressed (val == HIGH), we change state from 0 to 1, or vice versa. We do this using a small trick, as state can be only either 1 or 0. The trick I use involves a small mathematical expression based on the idea that 1 – 0 is 1 and 1 – 1 is 0: state = 1 – state; The line may not make much sense in mathematics, but it does in programming. The symbol = means “assign the result of what’s after me to the variable name before me"--in this case, the new value of state is assigned the value of 1 minus the old value of state.
• Pointroll iPad ads? Link didn't show anything