iPhone Application and programming Updates
<p>When a user logs into my iPhone App.  I store their userID and relevant information in [NSUserDefaults standardUserDefaults].  This way they are not required to log in each time they access my application.  </p>

<p>When my application is live in the app store and I make updates to the code will this information be lost - will they then be required to log in?  If so how do I go about preserving this information when I make updates?</p>

<p>And while I can't image this happening but should a user choose to delete my application after they have installed it - how would I know that they have deleted it?  I am using the push notifications and would like to flag the user as not being active so that I don't keep pushing out notifications to them.</p>

<p>Thanks Very Much
Cheryl</p>
