title: Session Variables
body: <p>How can i add Session Variable visible to the whole application in GWT?</p>
  
  <p>like in C# you would do something like</p>
  
  <pre><code>Session.Add("mySessionVal", "Hello");
  </code></pre>
  
  <p>How do you do this in GWT?</p>
  
  <p>Thank you</p>