title: Double semi-colon in batch file
body: <p>What is line 2 designed to do?</p>
  
  <pre><code>PATH=%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%FTPCABin%;%FTPAutoSysBin%;
  PATH=%PATH:;;=;%
  </code></pre>
  
  <p>PATH is the same, before and after line 2 executes.</p>