public class OracItem
{
    public int value;
    public int port;
}
	
 
public static class Orac
{
    public static Dictionary<string, OracItem> Properties = new Dictionary<string, OracItem>();
    public static int localPort = 0;		// set to publishPort by Clients stays at zero for Servers unless inbound data
    public static string  Lock = "LOCK";
}

Will tidy/improve a few things in time, e.g. Lock as object, but it's fine. I'm simple.

    public class OracSet : Indicator
    {
        #region Variables
        // Wizard generated variables
            private string property = ""; // Default setting for Property
        // User defined variables (add any user defined variables below)
        #endregion

        /// <summary>
        /// This method is used to configure the indicator and is called once before any bar data is loaded.
        /// </summary>
        protected override void Initialize()
        {
            Overlay = true;
            CalculateOnBarClose = false;
			
            if (property != "")
            {
                lock (Orac.Lock)
                {
                    OracItem  oi;
					
                    if (!Orac.Properties.ContainsKey (property))
                    {
                        Orac.Properties.Add (property, new OracItem());
                    }
					
                    oi = Orac.Properties[property];
					
                    oi.port  = Orac.localPort;
                    oi.value = 0;
                }
            }
        }

        /// <summary>
        /// Called on each bar update event (incoming tick)
        /// </summary>
        protected override void OnBarUpdate()
        {
            if (property != "")
            {
                 lock (Orac.Lock)
                {
                    Orac.Properties[property].value = (int) Close[0];
                }
            }
        }

    public class OracPlot : Indicator
    {
        #region Variables
        // Wizard generated variables
            private string property = ""; // Default setting for Property
        // User defined variables (add any user defined variables below)
        #endregion

        /// <summary>
        /// This method is used to configure the indicator and is called once before any bar data is loaded.
        /// </summary>
        protected override void Initialize()
        {
            Add(new Plot(Color.FromKnownColor(KnownColor.SeaGreen), PlotStyle.Line, "Plot0"));

            Overlay = false;
            CalculateOnBarClose = false;
        }

        /// <summary>
        /// Called on each bar update event (incoming tick)
        /// </summary>
        protected override void OnBarUpdate()
        {
            if (property != "")
            {
                int  value = 0;
				
                lock (Orac.Lock)
                {
                    if (Orac.Properties.ContainsKey (property))
                    {
                        value = Orac.Properties[property].value;
                    }
                }
				
                Plot0.Set(value);
            }
        }


    }