Determine a first use of an iPhone application
<p><br>
I develop an iPhone app and I want to show the user a welcome screen on the first load of the app after installation.<br>
That means that the next time the user will use my app he will not see that screen.  </p>

<p>Any ideas how to determine if this is the first load or not? (DB? File? Settings?)</p>

<p>Thanks!</p>
