title: Hiding a queryString in an ASP.NET Webapplication
body: <p>I have two webapplication, one is a simple authenticationsite which can authenticate the logged in user and <strong>redirects</strong> him then to another site.</p>
  
  <p>Therefore I have to pass ther userId (GUID) to the second application. Currently this is done via the URL but i would like to hide this id.</p>
  
  <p>Has anybody an idea how to do this properly?</p>
  
  <p>[EDIT]: I can't use the Session because of the ApplicationBoundaries (2 different Servers)</p>