title: Check if anyone is currently using an ASP.Net app (site)
body: <p>I build ASP.NET websites (hosted under IIS 6 usually, often with SQL Server backends and forms authentication).</p>
  
  <p>Clients sometimes ask if I can check whether there are people currently browsing (and/or whether there are users currently logged in to) their website at a given moment, usually so the can safely do a deployment (they want a hotfix, for example).</p>
  
  <p>I know the web is basically stateless so I can't be sure whether someone has closed the browser window, but I imagine there'd be some count of not-yet-timed-out sessions or something, and surely logged-in-users...</p>
  
  <p>Is there a standard and/or easy way to check this? </p>