creating a coupon for ipassbook using passsource.com, does anybody know how iphone determines which application to open based on the url?
<p>i am working on creating a coupon for ipassbook using passsource.com, does anybody know how iphone determines which application to open based on  the url?</p>

<p>I created a sample coupon with passsource.com API and it redirected me to the following URL
<a href="http://www.passsource.com/create.php?data=eNortjIxsVIKCUpyyzRIiwox1Q4Jjig38rNwNw73145wtkiqLE43zYsIsSjxjYxyDHZ1tVWyBlwwl9EPgQ,,&amp;template_id=2" rel="nofollow">http://www.passsource.com/create.php?data=eNortjIxsVIKCUpyyzRIiwox1Q4Jjig38rNwNw73145wtkiqLE43zYsIsSjxjYxyDHZ1tVWyBlwwl9EPgQ,,&amp;template_id=2</a></p>

<p>Asking to send this to the user, if the user opens this URL in the iphone it opens passbook application. I did not understand how? I even verified particular headers but none specific.</p>
