public static function & GetConfig ($appRootRelativePath) {
		if (!isset(self::$configsCache[$appRootRelativePath])) {
			$app = self::$app ?: self::$app = & \MvcCore\Application::GetInstance();
			$systemConfigClass = $app->GetConfigClass();
			$system = $systemConfigClass::GetSystemConfigPath() === '/' . ltrim($appRootRelativePath, '/');
			self::$configsCache[$appRootRelativePath] = & self::getConfigInstance(
				$appRootRelativePath, $system
			);
		}
		return self::$configsCache[$appRootRelativePath];
	}