I'm diving into iPad development and am learning a lot quickly, but everywhere I look, I have questions. After creating a new SplitView app in Xcode using the template, it generates the AppDelegate class, RootViewController class, and DetailViewController class. Along with that, it creates a .xib files for MainWinow.xib and DetailView.xib.

1. How do these five files work together?
2. Why is there a nib file for the DetailView, but not the RootView?
3. When I double click on the MainWindow.xib file, Interface Builder launches without a "View" window, why?

4. Below is the code for didFinishLaunchingWithOptions method inside the AppDelegate class. Why are we adding the splitViewController as a subview?

   (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
   
   
   // Override point for customization after app launch    
   rootViewController.managedObjectContext = self.managedObjectContext;
   
   
   // Add the split view controller's view to the window and display.
   [window addSubview:splitViewController.view];
   [window makeKeyAndVisible];
   
   
   return YES;
   

   }

Thanks so much in advance for all your help! I still have a lot to learn, so I apologize if this question is absurd in any way. I'm going to continue researching these questions right now!