private static AbstractPlatform configurationPlatform()
        {
            AbstractPlatform _platform;
            IGUIFactory      _gUIFactory;
            string           _osName = Environment.OSVersion.ToString();

            if (_osName.Contains("mac"))
            {
                _gUIFactory = new MacOSFactory();
                _platform   = new AbstractPlatform(_gUIFactory);
            }
            else
            {
                _gUIFactory = new WindowsFactory();
                _platform   = new AbstractPlatform(_gUIFactory);
            }
            return(_platform);
        }
        /**
         * EN: Application picks the factory type and creates it in run time
         * (usually at initialization stage), depending on the configuration or
         * environment variables.
         *
         * RU: Приложение выбирает тип и создаёт конкретные фабрики динамически
         * исходя из конфигурации или окружения.
         */
        private static Application ConfigureApplication()
        {
            Application app;
            IGuiFactory factory;
            String      osName = System.Environment.GetEnvironmentVariable("OS").ToLower();

            if (osName.Contains("mac"))
            {
                factory = new MacOSFactory();
                app     = new Application(factory);
            }
            else
            {
                factory = new WindowsFactory();
                app     = new Application(factory);
            }
            return(app);
        }