 <td valign="top" align="center">required for action="single". Ignored in other actions.</td>
  </tr>
  <tr>
    <td valign="top">linkfilename</td>
    <td valign="top">The name of the properties file to create in 
    each included directory.</td>
    <td valign="top" align="center">required for action="record". 
    Ignored in other actions.</td>
  </tr>
  <tr>
    <td valign="top">overwrite</td>
    <td valign="top">Overwrite existing links or not.</td>
    <td valign="top" align="center">No; defaults to