It's a concept we've seen spread to Wi-Fi enabled cameras for a while now—you can just pull out the official Canon or Sony or Olympus app, and control your camera remotely so that you don't have to be behind the lens to make it work. With Camera Plus, it's the same sort of idea. Both iOS devices need to be running the Camera Plus app, and both either setup for Wi-Fi or Bluetooth. WIth that, one can be set up as the trigger, and one as the camera. So you can set up an iPhone to take a photo of a big group of all your friends, and then actually hit the shutter when you're with them.