w active server brings up virtual IP interface.
	Meanwhile, the previous active server brings down the virtual IP interface.
	This enables the active pgpool to work using the same IP address even when servers is switched over.
	</p>

	<li>Automatic registration of a server as standby in recovery</li>
	<p>
	When broken server recovers or new server is attached,
	the watchdog process notifies the other watchdog process along with information of the new server,
	and the watchdog process receives information on