title: what's the system account to run asp.NET web app for each sites in IIS with different application pool?
body: <p>Suppose I have many different website created on IIS 7 on windows 2008 R2.
  Each of them may have different application pool:</p>
  
  <pre><code>.NET 1.1
  .NET 2.0
  .NET 3.5
  .NET 4.0
  </code></pre>
  
  <p>What the system account to run all those web app? If the app need to read/write file, need to set up right permission for specific folder, then how can I identify the right account to assign right permission?</p>