[slobra]

Thanks for the help, Lynne. I'm confused. I tried creating a new plugin with a hook location of global_start and the following code...

$activeusers = '';
if (($vbulletin->options['displayloggedin'] == 1 OR $vbulletin->options['displayloggedin'] == 2 OR ($vbulletin->options['displayloggedin'] > 2 AND $vbulletin->userinfo['userid'])) AND !$show['search_engine'])
{
	$datecut = TIMENOW - $vbulletin->options['cookietimeout'];
	$numbervisible = 0;
	$numberregistered = 0;
	$numberguest = 0;

	$hook_query_fields = $hook_query_joins = $hook_query_where = '';
	($hook = vBulletinHook::fetch_hook('forumhome_loggedinuser_query')) ? eval($hook) : false;

	$forumusers = $db->query_read_slave("
		SELECT
			user.username, (user.options & " . $vbulletin->bf_misc_useroptions['invisible'] . ") AS invisible, user.usergroupid,
			session.userid, session.inforum, session.lastactivity, session.badlocation,
			IF(displaygroupid=0, user.usergroupid, displaygroupid) AS displaygroupid, infractiongroupid
			$hook_query_fields
		FROM " . TABLE_PREFIX . "session AS session
		LEFT JOIN " . TABLE_PREFIX . "user AS user ON(user.userid = session.userid)
		$hook_query_joins
		WHERE session.lastactivity > $datecut
			$hook_query_where
		" . iif($vbulletin->options['displayloggedin'] == 1 OR $vbulletin->options['displayloggedin'] == 3, "ORDER BY username ASC") . "
	");

	if ($vbulletin->userinfo['userid'])
	{
		// fakes the user being online for an initial page view of index.php
		$vbulletin->userinfo['joingroupid'] = iif($vbulletin->userinfo['displaygroupid'], $vbulletin->userinfo['displaygroupid'], $vbulletin->userinfo['usergroupid']);
		$userinfos = array
		(
			$vbulletin->userinfo['userid'] => array
			(
				'userid'            =>& $vbulletin->userinfo['userid'],
				'username'          =>& $vbulletin->userinfo['username'],
				'invisible'         =>& $vbulletin->userinfo['invisible'],
				'inforum'           => 0,
				'lastactivity'      => TIMENOW,
				'usergroupid'       =>& $vbulletin->userinfo['usergroupid'],
				'displaygroupid'    =>& $vbulletin->userinfo['displaygroupid'],
				'infractiongroupid' =>& $vbulletin->userinfo['infractiongroupid'],
			)
		);
	}
	else
	{
		$userinfos = array();
	}
	$inforum = array();

	while ($loggedin = $db->fetch_array($forumusers))
	{
		$userid = $loggedin['userid'];
		if (!$userid)
		{	// Guest
			$numberguest++;
			if (!$loggedin['badlocation'])
			{
				$inforum["$loggedin[inforum]"]++;
			}
		}
		else if (empty($userinfos["$userid"]) OR ($userinfos["$userid"]['lastactivity'] < $loggedin['lastactivity']))
		{
			$userinfos["$userid"] = $loggedin;
		}
	}

	if (!$vbulletin->userinfo['userid'] AND $numberguest == 0)
	{
		$numberguest++;
	}

	foreach ($userinfos AS $userid => $loggedin)
	{
		$numberregistered++;
		if ($userid != $vbulletin->userinfo['userid'] AND !$loggedin['badlocation'])
		{
			$inforum["$loggedin[inforum]"]++;
		}
		fetch_musername($loggedin);

		($hook = vBulletinHook::fetch_hook('forumhome_loggedinuser')) ? eval($hook) : false;

		if (fetch_online_status($loggedin))
		{
			$numbervisible++;
			$show['comma_leader'] = ($activeusers != '');
			eval('$activeusers .= "' . fetch_template('forumhome_loggedinuser') . '";');
		}
	}

	// memory saving
	unset($userinfos, $loggedin);

	$db->free_result($forumusers);

	$totalonline = $numberregistered + $numberguest;
	$numberinvisible = $numberregistered - $numbervisible;

	// ### MAX LOGGEDIN USERS ################################
	if (intval($vbulletin->maxloggedin['maxonline']) <= $totalonline)
	{
		$vbulletin->maxloggedin['maxonline'] = $totalonline;
		$vbulletin->maxloggedin['maxonlinedate'] = TIMENOW;
		build_datastore('maxloggedin', serialize($vbulletin->maxloggedin), 1);
	}

	$recordusers = vb_number_format($vbulletin->maxloggedin['maxonline']);
	$recorddate = vbdate($vbulletin->options['dateformat'], $vbulletin->maxloggedin['maxonlinedate'], true);
	$recordtime = vbdate($vbulletin->options['timeformat'], $vbulletin->maxloggedin['maxonlinedate']);

	$show['loggedinusers'] = true;
}
else
{
	$show['loggedinusers'] = false;
}

...but it didn't work. No doubt I don't quite understand plugins well enough, but I'm learning!