title: What does the app delegate do in a xcode project?
body: <p>Ok, so when I create a new cocoa project, there's always 2 files that's created for me.  That's the <code>.h</code> and the <code>.m</code> <strong>NAME</strong> <code>AppDelegate</code> file.  I've read a lot of books about cocoa and the documentary from apple that told me to create new files instead of using it.  What's the point of those 2 files anyways?  And is it safe to delete them?</p>