cmd;
	if(! local_channel()) {
		info( t('Please login.') . EOL);
		$o .= '
' . login(($a->config['system']['register_policy'] == REGISTER_CLOSED) ? 0 : 1);
		return $o;
	}
	if(! is_site_admin()) {
		notice( t('Permission denied.') . EOL);
		return '';
	}
	if(argc() != 3)
		killme();
	$cmd  = argv(1);
	$hash = argv(2);
	if($cmd === 'deny') {
		if (!user_deny($hash)) killme();
	}
	if($cmd === 'allow') {
		if (!user_allow($hash)) killme();
	}
}