title: How to check in ASP.NET if the user is online?
body: <p>what is the logic behind this on this website "last activity: 1 min ago from this ip address "
  If you are obtaining the user's IP address in a hidden field , how can I do this in vb.net ?</p>
  
  <p>And how can I check how many users are online using the application ? </p>