C# WCF proxy Help me understand this example code...

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
using System.ServiceModel;
 
namespace ConsoleApplication1
{
    public delegate void SafeProxyInvocationHandler(out ICommunicationObject proxy);
 
    public static class SafeProxyHandler
    {
        public static Exception Invoke(SafeProxyInvocationHandler del)
        {
            return Invoke(null, del);
        }
 
        public static Exception Invoke(string messageTemplate,
                                        SafeProxyInvocationHandler del)
        {
            if (del == null)
                throw new ArgumentException("Expected delegate instance for handler to invoke!");
 
            ICommunicationObject proxy = null;
 
            try
            {
                del(out proxy);
                HandleClose(proxy);
 
                return null;
            }
            catch (TimeoutException exception)
            {
                HandleException(proxy, exception, messageTemplate);
                return exception;
            }
            catch (FaultException exception)
            {
                HandleException(proxy, exception, messageTemplate);
                return exception;
            }
            catch (CommunicationException exception)
            {
                HandleException(proxy, exception, messageTemplate);
                return exception;
            }
            catch (Exception exception)
            {
                HandleException(proxy, exception, messageTemplate);
                return exception;
            }
        }
 
        private static void HandleClose(ICommunicationObject proxy)
        {
            if (proxy != null
                && proxy.State != CommunicationState.Closed
                && proxy.State != CommunicationState.Closing
                && proxy.State != CommunicationState.Faulted)
                proxy.Close();
        }
 
        private static void HandleException(ICommunicationObject proxy,
                                                          Exception e,
                                                          string messageTemplate)
        {
            AbortClient(proxy);
            ReportException(e, messageTemplate);
        }
 
        private static void ReportException(Exception e, string template)
        {
            Trace.WriteLine(FormatMessage(template, e.GetType().Name));
        }
 
        private static string FormatMessage(string message, params string[] args)
        {
            return args == null || args.Length == 0 ? message : string.Format(message, args);
        }
 
        private static void AbortClient(ICommunicationObject proxy)
        {
            if (proxy != null)
                proxy.Abort();
        }
    }
}