protected function resolveConfigurationKey($keyAlias)
{
$globalConfig =& $GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['realurl'];
$maxLoops = 30;
do {
$lastKey = $keyAlias;
$keyAlias = $globalConfig[$keyAlias];
} while ($maxLoops-- && is_string($keyAlias));
return is_array($keyAlias) ? $lastKey : '_DEFAULT';
}