C#

private static void Start()
{
    //instanciate a new main menu object
    MainMenu mainMenu = new MainMenu();

    //instanciate a new login object
    Login login = new Login();

    //load the configuration
    Config.load();

    //check if login screen must be used
    ShowLogin = Config.LoginRequired;

    //execute the loop if not shutting down
    while ( !Shutdown )
    {
        //check if the login screen is required
        if ( ShowLogin )
        {
            //show the login
            login.ShowDialog();
        } else {
            //login user using anonymous profile
            UserName = "Anonymous";
        }

        //check if a user was logged in
        if ( !Shutdown && UserName != null )
        {
            //show the main menu
            mainMenu.ShowDialog();
        }
    }
}

[STAThread]
public static void Main(string[] args)
{
    //start the application process loop
    Application.Start();
    //start the message pump
    System.Windows.Forms.Application.Run();
}