diff --git a/binary/release.2.5.1.net.40.zip b/binary/release.2.5.1.net.40.zip
new file mode 100644
index 00000000..6656d37c
Binary files /dev/null and b/binary/release.2.5.1.net.40.zip differ
diff --git a/source/Samples/SlimSamples.cs b/source/Samples/SlimSamples.cs
index f606acf9..11a800c2 100644
--- a/source/Samples/SlimSamples.cs
+++ b/source/Samples/SlimSamples.cs
@@ -268,5 +268,20 @@ public string FirstHash(Dictionary<string, string> hash) {
         public Dictionary<string, string> SomeDictionary() {
             return new Dictionary<string, string>{{"name", "bob"}, {"address", "here"}};
         }
+
+        public string StringOf(int count) {
+            //var thread = new Thread(WriteStuff);
+            //thread.Start();
+            var result =  new string('*', count);
+            Console.WriteLine(result);
+            return result;
+        }
+
+        static void WriteStuff() {
+            for (var i = 0; i < 1000; i++) {
+                Thread.Sleep(1);
+                Console.WriteLine("hey");
+            }
+        }
     }
 }
diff --git a/source/fitSharp/Machine/Engine/Trace.cs b/source/fitSharp/Machine/Engine/Trace.cs
new file mode 100644
index 00000000..9e2a5a8d
--- /dev/null
+++ b/source/fitSharp/Machine/Engine/Trace.cs
@@ -0,0 +1,33 @@
+// Copyright © 2016 Syterra Software Inc. All rights reserved.
+// The use and distribution terms for this software are covered by the Common Public License 1.0 (http://opensource.org/licenses/cpl.php)
+// which can be found in the file license.txt at the root of this distribution. By using this software in any fashion, you are agreeing
+// to be bound by the terms of this license. You must not remove this notice, or any other, from this software.
+
+using System;
+using System.IO;
+using fitSharp.Machine.Model;
+
+namespace fitSharp.Machine.Engine {
+    public class Trace: Copyable {
+
+        public Copyable Copy() {
+            return new Trace {writer = writer};
+        }
+
+        public void File(string fileName) {
+            writer = new StreamWriter(fileName);
+        }
+
+        public void Stop() {
+            writer.Close();
+            writer = StreamWriter.Null;
+        }
+
+        public void Write(string label, string message) {
+            writer.WriteLine("{0:yyyy-MM-dd HH:mm:ss.fffff},{1},{2}", DateTime.Now, label, message);
+            writer.Flush();
+        }
+
+        StreamWriter writer = StreamWriter.Null;
+    }
+}
diff --git a/source/fitSharp/Slim/Service/ConsoleSession.cs b/source/fitSharp/Slim/Service/ConsoleSession.cs
index 66ee175a..7e162fc2 100644
--- a/source/fitSharp/Slim/Service/ConsoleSession.cs
+++ b/source/fitSharp/Slim/Service/ConsoleSession.cs
@@ -7,10 +7,13 @@
 using System.IO;
 using System.Text;
 using fitSharp.IO;
+using fitSharp.Machine.Engine;
 
 namespace fitSharp.Slim.Service {
     public class ConsoleSession: Session {
-        public ConsoleSession() {
+
+        public ConsoleSession(Memory memory) {
+            this.memory = memory;
             saveOut = Console.Out;
             saveError = Console.Error;
             CaptureConsole();
@@ -43,23 +46,29 @@ void WriteCaptured() {
         }
 
         void WriteEncoded(string prefix, StringWriter content) {
-            var encodedContent = prefix + content.ToString().Replace(Environment.NewLine, Environment.NewLine + prefix);
+            var contentString = content.ToString();
+            if (string.IsNullOrEmpty(contentString)) return;
+            var encodedContent = prefix + contentString.Replace(Environment.NewLine, Environment.NewLine + prefix);
             if (encodedContent.EndsWith(prefix)) {
                 encodedContent = encodedContent.Substring(0, encodedContent.Length - prefix.Length);
             }
+            memory.GetItem<Trace>().Write("ConsoleErr", encodedContent);
             saveError.Write(encodedContent);
         }
 
         void WriteToConsole(string message) {
+            memory.GetItem<Trace>().Write("ConsoleOut", message);
             saveOut.Write(message);
         }
 
-        static string ReadFromConsole(int length) {
+        string ReadFromConsole(int length) {
             var result = new StringBuilder(length);
             for (var i = 0; i < length; i++) {
                 result.Append((char) Console.Read());
             }
-            return result.ToString();
+            var message = result.ToString();
+            memory.GetItem<Trace>().Write("ConsoleIn", message);
+            return message;
         }
 
         void CaptureConsole() {
@@ -69,6 +78,7 @@ void CaptureConsole() {
             Console.SetError(captureError);
         }
 
+        readonly Memory memory;
         readonly TextWriter saveOut;
         readonly TextWriter saveError;
         StringWriter captureOut;
diff --git a/source/fitSharp/Slim/Service/Messenger.cs b/source/fitSharp/Slim/Service/Messenger.cs
index b30a765c..1fcfd6e8 100644
--- a/source/fitSharp/Slim/Service/Messenger.cs
+++ b/source/fitSharp/Slim/Service/Messenger.cs
@@ -6,15 +6,16 @@
 using System.Net;
 using System.Net.Sockets;
 using fitSharp.IO;
+using fitSharp.Machine.Engine;
 using fitSharp.Machine.Model;
 
 namespace fitSharp.Slim.Service {
     public class Messenger {
         public bool IsEnd { get; private set; }
 
-        public static Messenger Make(int port) {
+        public static Messenger Make(int port, Memory memory) {
             if (port == 1) {
-                return new Messenger(new ConsoleSession());
+                return new Messenger(new ConsoleSession(memory));
             }
             var listener = new TcpListener(IPAddress.Any, port);
             listener.Start();
diff --git a/source/fitSharp/Slim/Service/Runner.cs b/source/fitSharp/Slim/Service/Runner.cs
index 9ae12b7e..2e53efc7 100644
--- a/source/fitSharp/Slim/Service/Runner.cs
+++ b/source/fitSharp/Slim/Service/Runner.cs
@@ -1,4 +1,4 @@
-// Copyright © 2011 Syterra Software Inc. All rights reserved.
+// Copyright © 2016 Syterra Software Inc. All rights reserved.
 // The use and distribution terms for this software are covered by the Common Public License 1.0 (http://opensource.org/licenses/cpl.php)
 // which can be found in the file license.txt at the root of this distribution. By using this software in any fashion, you are agreeing
 // to be bound by the terms of this license. You must not remove this notice, or any other, from this software.
@@ -16,13 +16,13 @@ public class Runner: Runnable {
 
         public int Run(IList<string> commandLineArguments, Memory memory, ProgressReporter reporter) {
             service = new Service(memory);
-            ParseCommandLine(commandLineArguments);
+            ParseCommandLine(commandLineArguments, memory);
             new Interpreter(messenger, assemblyPaths, service).ProcessInstructions();
             return 0;
         }
 
-        private void ParseCommandLine(IList<string> commandLineArguments) {
-            messenger = Messenger.Make(int.Parse(commandLineArguments[commandLineArguments.Count - 1]));
+        private void ParseCommandLine(IList<string> commandLineArguments, Memory memory) {
+            messenger = Messenger.Make(int.Parse(commandLineArguments[commandLineArguments.Count - 1]), memory);
             if (commandLineArguments.Count > 1) {
                 assemblyPaths = commandLineArguments[0];
             }
diff --git a/source/fitSharp/Slim/Service/Service.cs b/source/fitSharp/Slim/Service/Service.cs
index 0d500891..2c63f134 100644
--- a/source/fitSharp/Slim/Service/Service.cs
+++ b/source/fitSharp/Slim/Service/Service.cs
@@ -1,4 +1,4 @@
-// Copyright © 2011 Syterra Software Inc. All rights reserved.
+// Copyright © 2016 Syterra Software Inc. All rights reserved.
 // The use and distribution terms for this software are covered by the Common Public License 1.0 (http://opensource.org/licenses/cpl.php)
 // which can be found in the file license.txt at the root of this distribution. By using this software in any fashion, you are agreeing
 // to be bound by the terms of this license. You must not remove this notice, or any other, from this software.
@@ -24,6 +24,7 @@ public Service(Memory memory) : base(memory) {
             Memory.GetItem<Symbols>();
 
             PushLibraryInstance(new TypedValue(new Actors(this)));
+            PushLibraryInstance(new TypedValue(new SlimFunctions(this)));
         }
 
         public void PushLibraryInstance(TypedValue instance) {
@@ -64,5 +65,17 @@ public void PopFixture() {
                 processor.Get<SavedInstances>().Save(actorInstanceName, actors.Pop());
             }
         }
+
+        class SlimFunctions {
+            public SlimFunctions(SlimProcessor processor) {
+                this.processor = processor;
+            }
+
+            public void _Configure(string feature, string item, string value) {
+                processor.Memory.GetItem<Trace>().File(value);
+            }
+
+            readonly SlimProcessor processor;
+        }
     }
 }
\ No newline at end of file
diff --git a/source/fitSharp/fitSharp.csproj b/source/fitSharp/fitSharp.csproj
index 24136f1d..52d79fee 100644
--- a/source/fitSharp/fitSharp.csproj
+++ b/source/fitSharp/fitSharp.csproj
@@ -106,6 +106,7 @@
     <Compile Include="Machine\Engine\MemberQuery.cs" />
     <Compile Include="Machine\Engine\MemberSpecification.cs" />
     <Compile Include="Machine\Engine\RuntimeMemberFactory.cs" />
+    <Compile Include="Machine\Engine\Trace.cs" />
     <Compile Include="Machine\Exception\IgnoredException.cs" />
     <Compile Include="Fit\Fixtures\Define.cs" />
     <Compile Include="Fit\Operators\CheckDefault.cs" />
diff --git a/source/fitSharpTest/NUnit/Slim/ConsoleSessionTest.cs b/source/fitSharpTest/NUnit/Slim/ConsoleSessionTest.cs
index 638bc10c..e46ff39a 100644
--- a/source/fitSharpTest/NUnit/Slim/ConsoleSessionTest.cs
+++ b/source/fitSharpTest/NUnit/Slim/ConsoleSessionTest.cs
@@ -5,6 +5,7 @@
 
 using System;
 using System.IO;
+using fitSharp.Machine.Engine;
 using fitSharp.Slim.Service;
 using NUnit.Framework;
 
@@ -21,7 +22,7 @@ public void SetUp() {
             Console.SetOut(testOut);
             testError = new StringWriter();
             Console.SetError(testError);
-            session = new ConsoleSession();
+            session = new ConsoleSession(new TypeDictionary());
         }
 
         [TearDown]