by default
            </p></td>
</tr>
<tr>
<td width="5%" valign="top" align="left"><p><a name="log.detailed.sink_frontends.async.c15"></a><a href="#log.detailed.sink_frontends.async.c14"><img src="../../../../../../doc/src/images/callouts/5.png" alt="5" border="0"></a> </p></td>
<td valign="top" align="left"><p>
              pointer to the pre-initialized backend
            </p></td>
</tr>
<tr>
<td width="5%" valign="top" align="left"><p><a name="log.detailed.sink_frontends.async.c17"></a><a href="#log.