title: How to impersonate a WellKnownSidType?
body: <p>I know I can impersonate a windows account using:
  <a href="http://msdn.microsoft.com/en-us/library/chf6fbt4.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/chf6fbt4.aspx</a></p>
  
  <p>But how do I go about impersonating a <code>WellKnownSidType</code> account?</p>
  
  <pre><code>SecurityIdentifier sid = new SecurityIdentifier(WellKnownSidType.LocalSystemSid, null);
  NTAccount account = sid.Translate(typeof(NTAccount)) as NTAccount;
  if (account != null)
  {
      //Impersonate here???
  }
  </code></pre>