title: Stop people having my website loaded on multiple tabs
body: <p>I want users to browse my site from <em>only</em> one tab in their browser. How can this be done? Would I use javascript and cookies? </p>
  
  <p>For example, I have a website: <strong><em>www.example.com</em></strong> - and I want my clients to only be able to visit the site from one single tab in one browser. If they open another tab and load the site (or a subpage of the site) - I want an alert "<em>Can't open multiple instances</em>", and then redirect them to an error page.</p>
  
  <p>Once thing to note - if the user changes the address from <strong><em>www.example.com/action/door/mine.aspx</em></strong> to <strong><em>www.example.com</em></strong> - that should work fine, because the user is in the same (original) tab.</p>
  
  <p>Any help will be appreciated. Thanks in advance.</p>