title: web server to fetch client's machine mac address
body: <p>I'm trying to build some complicated stuff for an C# winform application being build online and trying to gather some information here and there.I've looked on the web that it's possible to get a mac address of a computer on the network using either System.Net.NetworkInformation or System.Management.ManagementClass(which i can't reference for some reasons).Where are my worries</p>
  
  <ol>
  <li>Can  my web server online know the mac address of a client's machine connected to it?</li>
  <li>If question 1 is true i guess it will use IP (correct me if I'm wrong) what if client's machine is sitting behind a proxy server or using multiple web proxy?</li>
  <li>if question 1 and 2 are positive How to do that from the web server.</li>
  </ol>