title: How to I call a function at the same time on multiple iPhones?
body: <p>I'm starting to use GameKit for a p2p project, and I want to call a function at the same time on both clients.  Assuming their clocks aren't set to exactly the same time, how can I call NSTimer or whatever so my function is called at the same time on both clients?</p>
  
  <p>Thanks!</p>