title: Responder actions and responder chain
body: <p>I am relatively new to IPhone coding, although I have reached the point of working on a genuine (hopefully) saleable app.</p>
  
  <p>But one thing that is still mysterious is the responder chain.  All the books give passing reference to it, but I have not found one yet that describes how to modify that chain.  Another curiosity is that, when the First Responder icon is clicked in the IB, a little hookup box comes up with all sorts of choices to hook up to something, but I've never found any explanation of that.</p>
  
  <p>Does anyone know of an in-depth explanation of this responder process?</p>