Communication between Windows service and WCF service

My question is: How do communicate two windows services of which the first host the WCF ?

In fact, how one service windows can consume the WCF hosted in another windows service.

Because i want display the balloon tip notification in the task bar when i started my windows service. I created two services windows, the first host the WCF and the second consume the WCF more windows form application for the notification .

thanks !!!

It is my class which showing the balloon tip :
namespace MyWPFApp
{
public class Notification
{
public void ShowNotification()
{
NotifyIcon notifyIcon;
notifyIcon = new NotifyIcon();
notifyIcon.Icon = SystemIcons.Information;
notifyIcon.BalloonTipTitle = "Atos !!!";
notifyIcon.BalloonTipText = "Atos Notification Center test";
notifyIcon.BalloonTipIcon = ToolTipIcon.Info;
notifyIcon.Visible = true;
notifyIcon.ShowBalloonTip(30000);
}
}
}

This is my WCF Service :
public interface IService1
{
[OperationContract]
void TestWCF();


}

public class Service1 : IService1
{
public void TestWCF()
{

Notification notif = new Notification();

notif.ShowNotification();
}

}
}

My First Service windows which host the WFC :

protected override void OnStart(string[] args)
{
if (host != null)
{
host.Close();
}
host = new ServiceHost(typeof(AtosWCFService.Service1));
host.Open();
}


protected override void OnStop()
{
host.Close();
}

My Second Service windows to consume the WCF hosted inside The first windows service :

protected override void OnStart(string[] args)
{
MyServiceReference.Service1Client display = new MyServiceReference.Service1Client();
display.TestWCF();
}

But the Balloon tip not appear in the task bar icon !!!

Please help me!!!

Best Regards !!!