what is NSNotification Center ? why is it used ? (iPhone SDK)
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/1900352/what-is-nsnotification">What is NSNotification?</a>  </p>
</blockquote>



<p>what is NSNotification Center ? why is it used ? (iPhone SDK)</p>
