title: How does CurrentControlSet differ from ControlSet001 and ControlSet002?
body: <p>In the Windows registry, how does <code>CurrentControlSet</code> differ from
  <code>ControlSet001</code> and <code>ControlSet002</code>? Which should be set when installing for all
  users?</p>
  <p>We are trying to add an environment variable for all users. Is this correct?</p>
  <pre><code>HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Envinronment
  </code></pre>