A few questions I don't believe were covered in the book

  1. In the AppDelegate.m: What is the synthesize window = _window all about. I understand the synthesize window part, but not the = _window.

  2. In touchViewController.m, whats is the purpose of …initWithFrame:CGRectZero]]? the CGRectZero part.

  3. Why is there a controller in this program at all? The View seems to be doing everything anyway IE accepting the touches and responding accordingly.