C#

using System.Collections.Generic;

class Program
{
    static void Main(string[] args)
    {
        Manager.Ports[0].Open();
    }
}

public class Manager
{
    private static List<Port> ports;
    private static Manager manager = new Manager();

    static Manager()
    {
        Initialize();
    }
    private Manager()
    { }

    ~Manager()
    {
        CloseAll();
    }

    public static IList<Port> Ports
    {
        get { return ports.AsReadOnly(); }
    }

    public static void CloseAll()
    {
        foreach (Port port in ports)
            port.Close();
    }

    private static void Initialize()
    {
        ports = new List<Port>(1);
        ports.Add(new Port());
    }
}

public class Port
{
    internal Port() { }
    public void Close()
    {
    }
    public void Open()
    {
    }
}