title: Can I send a message to a single iBeacon device within a group?
body: <p>I'm just reading up on iBeacon, and I might want to use it for a project I'm currently involved in. What I currently understand from it is this:</p>
  
  <blockquote>
    <p>Simply put, an iBeacon device broadcasts a message to whomever is
    within range. This message includes the sender its mac-address, and
    from the intensity of its signal, the receiver can calculate the
    distance. iBeacon devices can either be senders, receivers, or both.</p>
  </blockquote>
  
  <p><strong>1) First of all; is this correct?</strong></p>
  
  <p>Secondly, on the wikipedia page I read that <code>it could enable payments at the point of sale (POS)</code>. Because I understand that it is basically a very local broadcast service I'm just trying to understand how something like that would work. </p>
  
  <p><strong>2) So would in case of a payment, the store or the customer initiate the payment?</strong></p>
  
  <p><strong>3) And how would you prevent that other nearby devices pick up the payment messages?</strong></p>
  
  <p><strong>4) Lastly; is it possible to send an iBeacon message to only one iBeacon device identified by its mac address?</strong></p>
  
  <p>Any tips and insights are very welcome!</p>