><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>key</em>&nbsp;</td><td>key. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>dest</em>&nbsp;</td><td>string to which value, if any, is appended. </td></tr>
  </table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>true if key had a corresponding value. </dd></dl>
    </td>
  </tr>
</table>
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