title: Difference between OPEN_ALWAYS and CREATE_ALWAYS in CreateFile() of Windows API
body: <p>Can anyone explain what the difference is between the creation dispositions <code>OPEN_ALWAYS</code> and <code>CREATE_ALWAYS</code> of the <a href="http://msdn.microsoft.com/en-us/library/aa363858%28VS.85%29.aspx" rel="noreferrer">CreateFile()</a> function of the windows API?</p>
  
  <p>To me it seems that they both simply 'create the file if it does not already exist'.</p>