Is there a master UI element that controls all subviews?
<p>If you have a seperate UIViewcontroller for each screen, along with its own NIB file, what is the master UI control that is controlling which viewcontroller to fire up and when?</p>

<p>Is this the job of the Controller and there is no master UI object that manages this?</p>

<p>I am very new, so maybe I need to understand things from the ground up, any links would be appreciated!</p>
