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Exposing a winforms application internals through WCF
public partial class Form1 : Form
{
  public Form1()
    {
      InitializeComponent();
      label1.Text = MySingleton.Instance.InitedAt.ToString();
    }
}

public class MySingleton
{
  private static MySingleton instance = new MySingleton();
  private DateTime inited;

  private MySingleton()
  {
    this.inited = DateTime.Now;
  }

  public static MySingleton Instance
  {
    get
    {
      return instance;
    }
  }

  public DateTime InitedAt
  {
    get
    {
      return this.inited;
    }
  }
}

[ServiceContract]
public interface IApplicationProbe {

  [OperationContract]
  string DoesItWork();

  [OperationContract]
  string SingletonInited();
}

public class ApplicationProbe : IApplicationProbe {
  public string DoesItWork(){
    return "Why yes, yes it does";
  }

  public string SingletonInited(){
    return MySingleton.Instance.InitedAt.ToString();
  }
}

public class YourImpportantSingleton
{
    public YourImpportantSingleton Instance { get; set; }
    public void DoSeriousBusiness(){...}
}

[ServiceContract]
public interface IYourContract
{
    void YourRemoteAction();
}

public class YourService : IYourContract
{
    public void YourRemoteAction()
    {
        YourImportantSingleton.Instance.DoSeriousBusiness();
    }
}