title: How to debug two web applications/services on IIS from within Visual Studio?
body: <p>In Visual Studio 2010, 
  I want to debug two web applications running on IIS at the same time.
  When debugging the first application it is ok. But when starting to debug the second application and first program is still in debug mode, Visual Studio prompts:</p>
  
  <blockquote>
    <p>unable to start debugging on the web server. a debugger is already
    attached</p>
  </blockquote>
  
  <p>How can I solve this problem?</p>