diff --git a/OpenSim/Region/ScriptEngine/Interfaces/IScriptEngine.cs b/OpenSim/Region/ScriptEngine/Interfaces/IScriptEngine.cs
index 17c270810f..20dcac9855 100644
--- a/OpenSim/Region/ScriptEngine/Interfaces/IScriptEngine.cs
+++ b/OpenSim/Region/ScriptEngine/Interfaces/IScriptEngine.cs
@@ -25,16 +25,17 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-using log4net;
 using System;
-using OpenSim.Region.ScriptEngine.Shared;
+using System.Reflection;
+using OpenSim.Framework;
 using OpenSim.Region.Framework.Scenes;
 using OpenSim.Region.Framework.Interfaces;
-using OpenMetaverse;
-using Nini.Config;
 using OpenSim.Region.ScriptEngine.Interfaces;
+using OpenSim.Region.ScriptEngine.Shared;
 using Amib.Threading;
-using OpenSim.Framework;
+using log4net;
+using Nini.Config;
+using OpenMetaverse;
 
 namespace OpenSim.Region.ScriptEngine.Interfaces
 {
@@ -76,6 +77,30 @@ namespace OpenSim.Region.ScriptEngine.Interfaces
         IConfigSource ConfigSource { get; }
         string ScriptEngineName { get; }
         string ScriptEnginePath { get; }
+
+        /// <summary>
+        /// Return the name of the base class that will be used for all running scripts.
+        /// </summary>
+        string ScriptBaseClassName { get; }
+
+        /// <summary>
+        /// Assemblies that need to be referenced when compiling scripts.
+        /// </summary>
+        /// <remarks>
+        /// These are currently additional to those always referenced by the compiler, BUT THIS MAY CHANGE IN THE 
+        /// FUTURE.
+        /// This can be null if there are no additional assemblies.
+        /// </remarks>
+        string[] ScriptReferencedAssemblies { get; }
+
+        /// <summary>
+        /// Parameters for the generated script's constructor.
+        /// </summary>
+        /// <remarks>
+        /// Can be null if there are no parameters
+        /// </remarks>
+        ParameterInfo[] ScriptBaseClassParameters { get; }
+
         IScriptApi GetApi(UUID itemID, string name);
     }
 }
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
index 79137b1b4b..6def207345 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
@@ -183,7 +183,17 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
         {
             if (m_coopSleepHandle == null)
                 System.Threading.Thread.Sleep(delay);
-            else if (m_coopSleepHandle.WaitOne(delay))
+            else
+                CheckForCoopTermination(delay);
+        }
+
+        /// <summary>
+        /// Check for co-operative termination.
+        /// </summary>
+        /// <param name='delay'>If called with 0, then just the check is performed with no wait.</param>
+        protected virtual void CheckForCoopTermination(int delay)
+        {
+            if (m_coopSleepHandle.WaitOne(delay))
                 throw new ScriptCoopStopException();
         }
 
diff --git a/OpenSim/Region/ScriptEngine/Shared/CodeTools/CSCodeGenerator.cs b/OpenSim/Region/ScriptEngine/Shared/CodeTools/CSCodeGenerator.cs
index 97dd0f6122..002f9b8a44 100644
--- a/OpenSim/Region/ScriptEngine/Shared/CodeTools/CSCodeGenerator.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/CodeTools/CSCodeGenerator.cs
@@ -49,6 +49,18 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
         private List<string> m_warnings = new List<string>();
         private IScriptModuleComms m_comms = null;
 
+        private bool m_insertCoopTerminationChecks;
+        private static string m_coopTerminationCheck = "opensim_reserved_CheckForCoopTermination();";
+
+        /// <summary>
+        /// Keep a record of the previous node when we do the parsing.
+        /// </summary>
+        /// <remarks>
+        /// We do this here because the parser generated by CSTools does not retain a reference to its parent node.
+        /// The previous node is required so we can correctly insert co-op termination checks when required.
+        /// </remarks>
+//        private SYMBOL m_previousNode;
+
         /// <summary>
         /// Creates an 'empty' CSCodeGenerator instance.
         /// </summary>
@@ -58,9 +70,10 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             ResetCounters();
         }
 
-        public CSCodeGenerator(IScriptModuleComms comms)
+        public CSCodeGenerator(IScriptModuleComms comms, bool insertCoopTerminationChecks)
         {
             m_comms = comms;
+            m_insertCoopTerminationChecks = insertCoopTerminationChecks;
             ResetCounters();
         }
 
@@ -155,7 +168,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             // here's the payload
             retstr += GenerateLine();
             foreach (SYMBOL s in m_astRoot.kids)
-                retstr += GenerateNode(s);
+                retstr += GenerateNode(m_astRoot, s);
 
             // close braces!
             m_braceCount--;
@@ -165,7 +178,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
 
             // Removes all carriage return characters which may be generated in Windows platform. Is there
             // cleaner way of doing this?
-            retstr=retstr.Replace("\r", "");
+            retstr = retstr.Replace("\r", "");
 
             return retstr;
         }
@@ -191,9 +204,10 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
         /// Recursively called to generate each type of node. Will generate this
         /// node, then all it's children.
         /// </summary>
+        /// <param name="previousSymbol">The parent node.</param>
         /// <param name="s">The current node to generate code for.</param>
         /// <returns>String containing C# code for SYMBOL s.</returns>
-        private string GenerateNode(SYMBOL s)
+        private string GenerateNode(SYMBOL previousSymbol, SYMBOL s)
         {
             string retstr = String.Empty;
 
@@ -207,11 +221,11 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             else if (s is State)
                 retstr += GenerateState((State) s);
             else if (s is CompoundStatement)
-                retstr += GenerateCompoundStatement((CompoundStatement) s);
+                retstr += GenerateCompoundStatement(previousSymbol, (CompoundStatement) s);
             else if (s is Declaration)
                 retstr += GenerateDeclaration((Declaration) s);
             else if (s is Statement)
-                retstr += GenerateStatement((Statement) s);
+                retstr += GenerateStatement(previousSymbol, (Statement) s);
             else if (s is ReturnStatement)
                 retstr += GenerateReturnStatement((ReturnStatement) s);
             else if (s is JumpLabel)
@@ -261,7 +275,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             else
             {
                 foreach (SYMBOL kid in s.kids)
-                    retstr += GenerateNode(kid);
+                    retstr += GenerateNode(s, kid);
             }
 
             return retstr;
@@ -295,7 +309,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             retstr += GenerateLine(")");
 
             foreach (SYMBOL kid in remainingKids)
-                retstr += GenerateNode(kid);
+                retstr += GenerateNode(gf, kid);
 
             return retstr;
         }
@@ -312,7 +326,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             foreach (SYMBOL s in gv.kids)
             {
                 retstr += Indent();
-                retstr += GenerateNode(s);
+                retstr += GenerateNode(gv, s);
                 retstr += GenerateLine(";");
             }
 
@@ -365,7 +379,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             retstr += GenerateLine(")");
 
             foreach (SYMBOL kid in remainingKids)
-                retstr += GenerateNode(kid);
+                retstr += GenerateNode(se, kid);
 
             return retstr;
         }
@@ -404,7 +418,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
 
             foreach (SYMBOL s in al.kids)
             {
-                retstr += GenerateNode(s);
+                retstr += GenerateNode(al, s);
                 if (0 < comma--)
                     retstr += Generate(", ");
             }
@@ -417,7 +431,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
         /// </summary>
         /// <param name="cs">The CompoundStatement node.</param>
         /// <returns>String containing C# code for CompoundStatement cs.</returns>
-        private string GenerateCompoundStatement(CompoundStatement cs)
+        private string GenerateCompoundStatement(SYMBOL previousSymbol, CompoundStatement cs)
         {
             string retstr = String.Empty;
 
@@ -425,8 +439,19 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             retstr += GenerateIndentedLine("{");
             m_braceCount++;
 
+            if (m_insertCoopTerminationChecks)
+            {
+                // We have to check in event functions as well because the user can manually call these.
+                if (previousSymbol is GlobalFunctionDefinition 
+                    || previousSymbol is WhileStatement 
+                    || previousSymbol is DoWhileStatement 
+                    || previousSymbol is ForLoopStatement
+                    || previousSymbol is StateEvent)
+                retstr += GenerateIndentedLine(m_coopTerminationCheck);
+            }
+
             foreach (SYMBOL kid in cs.kids)
-                retstr += GenerateNode(kid);
+                retstr += GenerateNode(cs, kid);
 
             // closing brace
             m_braceCount--;
@@ -450,13 +475,24 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
         /// </summary>
         /// <param name="s">The Statement node.</param>
         /// <returns>String containing C# code for Statement s.</returns>
-        private string GenerateStatement(Statement s)
+        private string GenerateStatement(SYMBOL previousSymbol, Statement s)
         {
             string retstr = String.Empty;
             bool printSemicolon = true;
 
             retstr += Indent();
 
+            if (m_insertCoopTerminationChecks)
+            {
+                // We have to check in event functions as well because the user can manually call these.
+                if (previousSymbol is GlobalFunctionDefinition 
+                    || previousSymbol is WhileStatement 
+                    || previousSymbol is DoWhileStatement 
+                    || previousSymbol is ForLoop
+                    || previousSymbol is StateEvent)
+                retstr += Generate(m_coopTerminationCheck);
+            }
+
             if (0 < s.kids.Count)
             {
                 // Jump label prints its own colon, we don't need a semicolon.
@@ -466,7 +502,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
                 // (MONO) error.
                 if (!(s.kids.Top is IdentExpression && 1 == s.kids.Count))
                     foreach (SYMBOL kid in s.kids)
-                        retstr += GenerateNode(kid);
+                        retstr += GenerateNode(s, kid);
             }
 
             if (printSemicolon)
@@ -487,10 +523,10 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             List<string> identifiers = new List<string>();
             checkForMultipleAssignments(identifiers, a);
 
-            retstr += GenerateNode((SYMBOL) a.kids.Pop());
+            retstr += GenerateNode(a, (SYMBOL) a.kids.Pop());
             retstr += Generate(String.Format(" {0} ", a.AssignmentType), a);
             foreach (SYMBOL kid in a.kids)
-                retstr += GenerateNode(kid);
+                retstr += GenerateNode(a, kid);
 
             return retstr;
         }
@@ -563,7 +599,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             retstr += Generate("return ", rs);
 
             foreach (SYMBOL kid in rs.kids)
-                retstr += GenerateNode(kid);
+                retstr += GenerateNode(rs, kid);
 
             return retstr;
         }
@@ -575,7 +611,14 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
         /// <returns>String containing C# code for JumpLabel jl.</returns>
         private string GenerateJumpLabel(JumpLabel jl)
         {
-            return Generate(String.Format("{0}:", CheckName(jl.LabelName)), jl) + " NoOp();\n";
+            string labelStatement;
+
+            if (m_insertCoopTerminationChecks)
+                labelStatement = m_coopTerminationCheck + "\n";
+            else
+                labelStatement = "NoOp();\n";
+
+            return Generate(String.Format("{0}: ", CheckName(jl.LabelName)), jl) + labelStatement;
         }
 
         /// <summary>
@@ -598,14 +641,14 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             string retstr = String.Empty;
 
             retstr += GenerateIndented("if (", ifs);
-            retstr += GenerateNode((SYMBOL) ifs.kids.Pop());
+            retstr += GenerateNode(ifs, (SYMBOL) ifs.kids.Pop());
             retstr += GenerateLine(")");
 
             // CompoundStatement handles indentation itself but we need to do it
             // otherwise.
             bool indentHere = ifs.kids.Top is Statement;
             if (indentHere) m_braceCount++;
-            retstr += GenerateNode((SYMBOL) ifs.kids.Pop());
+            retstr += GenerateNode(ifs, (SYMBOL) ifs.kids.Pop());
             if (indentHere) m_braceCount--;
 
             if (0 < ifs.kids.Count) // do it again for an else
@@ -614,7 +657,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
 
                 indentHere = ifs.kids.Top is Statement;
                 if (indentHere) m_braceCount++;
-                retstr += GenerateNode((SYMBOL) ifs.kids.Pop());
+                retstr += GenerateNode(ifs, (SYMBOL) ifs.kids.Pop());
                 if (indentHere) m_braceCount--;
             }
 
@@ -641,14 +684,14 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             string retstr = String.Empty;
 
             retstr += GenerateIndented("while (", ws);
-            retstr += GenerateNode((SYMBOL) ws.kids.Pop());
+            retstr += GenerateNode(ws, (SYMBOL) ws.kids.Pop());
             retstr += GenerateLine(")");
 
             // CompoundStatement handles indentation itself but we need to do it
             // otherwise.
             bool indentHere = ws.kids.Top is Statement;
             if (indentHere) m_braceCount++;
-            retstr += GenerateNode((SYMBOL) ws.kids.Pop());
+            retstr += GenerateNode(ws, (SYMBOL) ws.kids.Pop());
             if (indentHere) m_braceCount--;
 
             return retstr;
@@ -669,11 +712,11 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             // otherwise.
             bool indentHere = dws.kids.Top is Statement;
             if (indentHere) m_braceCount++;
-            retstr += GenerateNode((SYMBOL) dws.kids.Pop());
+            retstr += GenerateNode(dws, (SYMBOL) dws.kids.Pop());
             if (indentHere) m_braceCount--;
 
             retstr += GenerateIndented("while (", dws);
-            retstr += GenerateNode((SYMBOL) dws.kids.Pop());
+            retstr += GenerateNode(dws, (SYMBOL) dws.kids.Pop());
             retstr += GenerateLine(");");
 
             return retstr;
@@ -702,7 +745,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             retstr += Generate("; ");
             // for (x = 0; x < 10; x++)
             //             ^^^^^^
-            retstr += GenerateNode((SYMBOL) fl.kids.Pop());
+            retstr += GenerateNode(fl, (SYMBOL) fl.kids.Pop());
             retstr += Generate("; ");
             // for (x = 0; x < 10; x++)
             //                     ^^^
@@ -713,7 +756,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             // otherwise.
             bool indentHere = fl.kids.Top is Statement;
             if (indentHere) m_braceCount++;
-            retstr += GenerateNode((SYMBOL) fl.kids.Pop());
+            retstr += GenerateNode(fl, (SYMBOL) fl.kids.Pop());
             if (indentHere) m_braceCount--;
 
             return retstr;
@@ -758,7 +801,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
                 while (s is ParenthesisExpression)
                     s = (SYMBOL)s.kids.Pop();
                     
-                retstr += GenerateNode(s);
+                retstr += GenerateNode(fls, s);
                 if (0 < comma--)
                     retstr += Generate(", ");
             }
@@ -779,20 +822,20 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             {
                 // special case handling for logical and/or, see Mantis 3174
                 retstr += "((bool)(";
-                retstr += GenerateNode((SYMBOL)be.kids.Pop());
+                retstr += GenerateNode(be, (SYMBOL)be.kids.Pop());
                 retstr += "))";
                 retstr += Generate(String.Format(" {0} ", be.ExpressionSymbol.Substring(0,1)), be);
                 retstr += "((bool)(";
                 foreach (SYMBOL kid in be.kids)
-                    retstr += GenerateNode(kid);
+                    retstr += GenerateNode(be, kid);
                 retstr += "))";
             }
             else
             {
-                retstr += GenerateNode((SYMBOL)be.kids.Pop());
+                retstr += GenerateNode(be, (SYMBOL)be.kids.Pop());
                 retstr += Generate(String.Format(" {0} ", be.ExpressionSymbol), be);
                 foreach (SYMBOL kid in be.kids)
-                    retstr += GenerateNode(kid);
+                    retstr += GenerateNode(be, kid);
             }
 
             return retstr;
@@ -808,7 +851,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             string retstr = String.Empty;
 
             retstr += Generate(ue.UnarySymbol, ue);
-            retstr += GenerateNode((SYMBOL) ue.kids.Pop());
+            retstr += GenerateNode(ue, (SYMBOL) ue.kids.Pop());
 
             return retstr;
         }
@@ -824,7 +867,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
 
             retstr += Generate("(");
             foreach (SYMBOL kid in pe.kids)
-                retstr += GenerateNode(kid);
+                retstr += GenerateNode(pe, kid);
             retstr += Generate(")");
 
             return retstr;
@@ -861,7 +904,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
 
             // we wrap all typecasted statements in parentheses
             retstr += Generate(String.Format("({0}) (", te.TypecastType), te);
-            retstr += GenerateNode((SYMBOL) te.kids.Pop());
+            retstr += GenerateNode(te, (SYMBOL) te.kids.Pop());
             retstr += Generate(")");
 
             return retstr;
@@ -931,7 +974,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             }
             
             foreach (SYMBOL kid in fc.kids)
-                retstr += GenerateNode(kid);
+                retstr += GenerateNode(fc, kid);
 
             retstr += Generate(")");
 
@@ -980,11 +1023,11 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             string retstr = String.Empty;
 
             retstr += Generate(String.Format("new {0}(", vc.Type), vc);
-            retstr += GenerateNode((SYMBOL) vc.kids.Pop());
+            retstr += GenerateNode(vc, (SYMBOL) vc.kids.Pop());
             retstr += Generate(", ");
-            retstr += GenerateNode((SYMBOL) vc.kids.Pop());
+            retstr += GenerateNode(vc, (SYMBOL) vc.kids.Pop());
             retstr += Generate(", ");
-            retstr += GenerateNode((SYMBOL) vc.kids.Pop());
+            retstr += GenerateNode(vc, (SYMBOL) vc.kids.Pop());
             retstr += Generate(")");
 
             return retstr;
@@ -1000,13 +1043,13 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             string retstr = String.Empty;
 
             retstr += Generate(String.Format("new {0}(", rc.Type), rc);
-            retstr += GenerateNode((SYMBOL) rc.kids.Pop());
+            retstr += GenerateNode(rc, (SYMBOL) rc.kids.Pop());
             retstr += Generate(", ");
-            retstr += GenerateNode((SYMBOL) rc.kids.Pop());
+            retstr += GenerateNode(rc, (SYMBOL) rc.kids.Pop());
             retstr += Generate(", ");
-            retstr += GenerateNode((SYMBOL) rc.kids.Pop());
+            retstr += GenerateNode(rc, (SYMBOL) rc.kids.Pop());
             retstr += Generate(", ");
-            retstr += GenerateNode((SYMBOL) rc.kids.Pop());
+            retstr += GenerateNode(rc, (SYMBOL) rc.kids.Pop());
             retstr += Generate(")");
 
             return retstr;
@@ -1024,7 +1067,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             retstr += Generate(String.Format("new {0}(", lc.Type), lc);
 
             foreach (SYMBOL kid in lc.kids)
-                retstr += GenerateNode(kid);
+                retstr += GenerateNode(lc, kid);
 
             retstr += Generate(")");
 
diff --git a/OpenSim/Region/ScriptEngine/Shared/CodeTools/Compiler.cs b/OpenSim/Region/ScriptEngine/Shared/CodeTools/Compiler.cs
index 17a0d69838..8f6055624b 100644
--- a/OpenSim/Region/ScriptEngine/Shared/CodeTools/Compiler.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/CodeTools/Compiler.cs
@@ -31,6 +31,7 @@ using System.Collections.Generic;
 using System.Globalization;
 using System.Reflection;
 using System.IO;
+using System.Linq;
 using System.Text;
 using Microsoft.CSharp;
 //using Microsoft.JScript;
@@ -72,6 +73,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
         private bool CompileWithDebugInformation;
         private Dictionary<string, bool> AllowedCompilers = new Dictionary<string, bool>(StringComparer.CurrentCultureIgnoreCase);
         private Dictionary<string, enumCompileType> LanguageMapping = new Dictionary<string, enumCompileType>(StringComparer.CurrentCultureIgnoreCase);
+        private bool m_insertCoopTerminationCalls;
 
         private string FilePrefix;
         private string ScriptEnginesPath = null;
@@ -95,20 +97,22 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
         private Dictionary<string, Dictionary<KeyValuePair<int, int>, KeyValuePair<int, int>>> m_lineMaps =
             new Dictionary<string, Dictionary<KeyValuePair<int, int>, KeyValuePair<int, int>>>();
 
+        public bool in_startup = true;
+
         public Compiler(IScriptEngine scriptEngine)
         {
-            m_scriptEngine = scriptEngine;;
+            m_scriptEngine = scriptEngine;
             ScriptEnginesPath = scriptEngine.ScriptEnginePath;
             ReadConfig();
         }
 
-        public bool in_startup = true;
         public void ReadConfig()
         {
             // Get some config
             WriteScriptSourceToDebugFile = m_scriptEngine.Config.GetBoolean("WriteScriptSourceToDebugFile", false);
             CompileWithDebugInformation = m_scriptEngine.Config.GetBoolean("CompileWithDebugInformation", true);
             bool DeleteScriptsOnStartup = m_scriptEngine.Config.GetBoolean("DeleteScriptsOnStartup", true);
+            m_insertCoopTerminationCalls = m_scriptEngine.Config.GetString("ScriptStopStrategy", "abort") == "co-op";
 
             // Get file prefix from scriptengine name and make it file system safe:
             FilePrefix = "CommonCompiler";
@@ -386,7 +390,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             if (language == enumCompileType.lsl)
             {
                 // Its LSL, convert it to C#
-                LSL_Converter = (ICodeConverter)new CSCodeGenerator(comms);
+                LSL_Converter = (ICodeConverter)new CSCodeGenerator(comms, m_insertCoopTerminationCalls);
                 compileScript = LSL_Converter.Convert(Script);
 
                 // copy converter warnings into our warnings.
@@ -411,16 +415,17 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             {
                 case enumCompileType.cs:
                 case enumCompileType.lsl:
-                    compileScript = CreateCSCompilerScript(compileScript);
+                    compileScript = CreateCSCompilerScript(
+                        compileScript, m_scriptEngine.ScriptBaseClassName, m_scriptEngine.ScriptBaseClassParameters);
                     break;
                 case enumCompileType.vb:
-                    compileScript = CreateVBCompilerScript(compileScript);
+                    compileScript = CreateVBCompilerScript(compileScript, m_scriptEngine.ScriptBaseClassName);
                     break;
 //                case enumCompileType.js:
-//                    compileScript = CreateJSCompilerScript(compileScript);
+//                    compileScript = CreateJSCompilerScript(compileScript, m_scriptEngine.ScriptBaseClassName);
 //                    break;
                 case enumCompileType.yp:
-                    compileScript = CreateYPCompilerScript(compileScript);
+                    compileScript = CreateYPCompilerScript(compileScript, m_scriptEngine.ScriptBaseClassName);
                     break;
             }
 
@@ -451,43 +456,59 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
 //            return compileScript;
 //        }
 
-        private static string CreateCSCompilerScript(string compileScript)
+        private static string CreateCSCompilerScript(
+            string compileScript, string baseClassName, ParameterInfo[] constructorParameters)
         {
-            compileScript = String.Empty +
-                "using OpenSim.Region.ScriptEngine.Shared; using System.Collections.Generic;\r\n" +
-                String.Empty + "namespace SecondLife { " +
-                String.Empty + "public class Script : OpenSim.Region.ScriptEngine.Shared.ScriptBase.ScriptBaseClass { \r\n" +
-                @"public Script() { } " +
-                compileScript +
-                "} }\r\n";
+            compileScript = string.Format(    
+@"using OpenSim.Region.ScriptEngine.Shared; 
+using System.Collections.Generic;
+
+namespace SecondLife 
+{{ 
+    public class Script : {0} 
+    {{
+        public Script({1}) : base({2}) {{}}
+{3}
+    }}
+}}",
+                baseClassName, 
+                constructorParameters != null 
+                    ? string.Join(", ", Array.ConvertAll<ParameterInfo, string>(constructorParameters, pi => pi.ToString())) 
+                    : "", 
+                constructorParameters != null 
+                    ? string.Join(", ", Array.ConvertAll<ParameterInfo, string>(constructorParameters, pi => pi.Name)) 
+                    : "", 
+                compileScript);
+
             return compileScript;
         }
 
-        private static string CreateYPCompilerScript(string compileScript)
+        private static string CreateYPCompilerScript(string compileScript, string baseClassName)
         {
             compileScript = String.Empty +
                        "using OpenSim.Region.ScriptEngine.Shared.YieldProlog; " +
                         "using OpenSim.Region.ScriptEngine.Shared; using System.Collections.Generic;\r\n" +
                         String.Empty + "namespace SecondLife { " +
-                        String.Empty + "public class Script : OpenSim.Region.ScriptEngine.Shared.ScriptBase.ScriptBaseClass  { \r\n" +
+                        String.Empty + "public class Script : " + baseClassName + " { \r\n" +
                         //@"public Script() { } " +
                         @"static OpenSim.Region.ScriptEngine.Shared.YieldProlog.YP YP=null; " +
                         @"public Script() {  YP= new OpenSim.Region.ScriptEngine.Shared.YieldProlog.YP(); } " +
-
                         compileScript +
                         "} }\r\n";
+
             return compileScript;
         }
 
-        private static string CreateVBCompilerScript(string compileScript)
+        private static string CreateVBCompilerScript(string compileScript, string baseClassName)
         {
             compileScript = String.Empty +
                 "Imports OpenSim.Region.ScriptEngine.Shared: Imports System.Collections.Generic: " +
                 String.Empty + "NameSpace SecondLife:" +
-                String.Empty + "Public Class Script: Inherits OpenSim.Region.ScriptEngine.Shared.ScriptBase.ScriptBaseClass: " +
+                String.Empty + "Public Class Script: Inherits " + baseClassName +
                 "\r\nPublic Sub New()\r\nEnd Sub: " +
                 compileScript +
                 ":End Class :End Namespace\r\n";
+
             return compileScript;
         }
 
@@ -547,6 +568,11 @@ namespace OpenSim.Region.ScriptEngine.Shared.CodeTools
             parameters.ReferencedAssemblies.Add(Path.Combine(rootPath,
                     "OpenSim.Region.ScriptEngine.Shared.Api.Runtime.dll"));
 
+            if (m_scriptEngine.ScriptReferencedAssemblies != null)
+                Array.ForEach<string>(
+                    m_scriptEngine.ScriptReferencedAssemblies, 
+                    a => parameters.ReferencedAssemblies.Add(Path.Combine(rootPath, a)));
+
             if (lang == enumCompileType.yp)
             {
                 parameters.ReferencedAssemblies.Add(Path.Combine(rootPath,
diff --git a/OpenSim/Region/ScriptEngine/Shared/Instance/ScriptInstance.cs b/OpenSim/Region/ScriptEngine/Shared/Instance/ScriptInstance.cs
index 75aea2b0b1..e6ec0e1867 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Instance/ScriptInstance.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Instance/ScriptInstance.cs
@@ -267,13 +267,27 @@ namespace OpenSim.Region.ScriptEngine.Shared.Instance
             try
             {
                 if (dom != System.AppDomain.CurrentDomain)
-                    m_Script = (IScript)dom.CreateInstanceAndUnwrap(
+                    m_Script 
+                        = (IScript)dom.CreateInstanceAndUnwrap(
                             Path.GetFileNameWithoutExtension(assembly),
-                            "SecondLife.Script");
+                            "SecondLife.Script",
+                            false,
+                            BindingFlags.Default,
+                            null,
+                            new object[] { m_coopSleepHandle },
+                            null,
+                            null,
+                            null);
                 else
-                    m_Script = (IScript)Assembly.Load(
-                            Path.GetFileNameWithoutExtension(assembly)).CreateInstance(
-                            "SecondLife.Script");
+                    m_Script 
+                        = (IScript)Assembly.Load(Path.GetFileNameWithoutExtension(assembly)).CreateInstance(
+                            "SecondLife.Script", 
+                            false, 
+                            BindingFlags.Default, 
+                            null, 
+                            new object[] { m_coopSleepHandle }, 
+                            null, 
+                            null);
 
                 //ILease lease = (ILease)RemotingServices.GetLifetimeService(m_Script as ScriptBaseClass);
                 //RemotingServices.GetLifetimeService(m_Script as ScriptBaseClass);
diff --git a/OpenSim/Region/ScriptEngine/XEngine/Api/Runtime/XEngineScriptBase.cs b/OpenSim/Region/ScriptEngine/XEngine/Api/Runtime/XEngineScriptBase.cs
new file mode 100644
index 0000000000..f4211c8286
--- /dev/null
+++ b/OpenSim/Region/ScriptEngine/XEngine/Api/Runtime/XEngineScriptBase.cs
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSimulator Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Runtime.Remoting;
+using System.Runtime.Remoting.Lifetime;
+using System.Security.Permissions;
+using System.Threading;
+using System.Reflection;
+using System.Collections;
+using System.Collections.Generic;
+using OpenSim.Region.ScriptEngine.Interfaces;
+using OpenSim.Region.ScriptEngine.Shared;
+using OpenSim.Region.ScriptEngine.Shared.ScriptBase;
+
+namespace OpenSim.Region.ScriptEngine.XEngine.ScriptBase
+{
+    public class XEngineScriptBase : ScriptBaseClass
+    {
+        /// <summary>
+        /// Used for script sleeps when we are using co-operative script termination.
+        /// </summary>
+        /// <remarks>null if co-operative script termination is not active</remarks>  
+        WaitHandle m_coopSleepHandle;
+
+        public XEngineScriptBase(WaitHandle coopSleepHandle) : base()
+        {
+            m_coopSleepHandle = coopSleepHandle;
+        }
+
+        public void opensim_reserved_CheckForCoopTermination()
+        {
+            if (m_coopSleepHandle != null && m_coopSleepHandle.WaitOne(0))
+                throw new ScriptCoopStopException();
+        }
+    }
+}
\ No newline at end of file
diff --git a/OpenSim/Region/ScriptEngine/XEngine/XEngine.cs b/OpenSim/Region/ScriptEngine/XEngine/XEngine.cs
index 82ddbec761..35825d48ed 100644
--- a/OpenSim/Region/ScriptEngine/XEngine/XEngine.cs
+++ b/OpenSim/Region/ScriptEngine/XEngine/XEngine.cs
@@ -53,6 +53,7 @@ using OpenSim.Region.ScriptEngine.Shared.Instance;
 using OpenSim.Region.ScriptEngine.Shared.Api;
 using OpenSim.Region.ScriptEngine.Shared.Api.Plugins;
 using OpenSim.Region.ScriptEngine.Interfaces;
+using OpenSim.Region.ScriptEngine.XEngine.ScriptBase;
 using Timer = OpenSim.Region.ScriptEngine.Shared.Api.Plugins.Timer;
 
 using ScriptCompileQueue = OpenSim.Framework.LocklessQueue<object[]>;
@@ -176,6 +177,12 @@ namespace OpenSim.Region.ScriptEngine.XEngine
             get { return "XEngine"; }
         }
 
+        public string ScriptBaseClassName { get; private set; }
+
+        public ParameterInfo[] ScriptBaseClassParameters { get; private set; }
+
+        public string[] ScriptReferencedAssemblies { get; private set; }
+
         public Scene World
         {
             get { return m_Scene; }
@@ -230,6 +237,12 @@ namespace OpenSim.Region.ScriptEngine.XEngine
 
             m_ScriptConfig = configSource.Configs["XEngine"];
             m_ConfigSource = configSource;
+
+            ScriptBaseClassName = typeof(XEngineScriptBase).FullName;
+            ScriptBaseClassParameters = typeof(XEngineScriptBase).GetConstructor(new Type[] { typeof(WaitHandle) }).GetParameters();
+            ScriptReferencedAssemblies = new string[] { Path.GetFileName(typeof(XEngineScriptBase).Assembly.Location) };
+
+            Console.WriteLine("ASSEMBLY NAME: {0}", ScriptReferencedAssemblies[0]);
         }
 
         public void AddRegion(Scene scene)
@@ -1179,7 +1192,9 @@ namespace OpenSim.Region.ScriptEngine.XEngine
                 }
                 catch (Exception e)
                 {
-//                    m_log.ErrorFormat("[XEngine]: Exception when rezzing script {0}{1}", e.Message, e.StackTrace);
+//                    m_log.ErrorFormat(
+//                        "[XEngine]: Exception when rezzing script with item ID {0}, {1}{2}", 
+//                        itemID, e.Message, e.StackTrace);
 
     //                try
     //                {
diff --git a/prebuild.xml b/prebuild.xml
index 529b494d96..935c857b82 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -2378,6 +2378,40 @@
       </Files>
     </Project>
 
+    <Project frameworkVersion="v3_5" name="OpenSim.Region.ScriptEngine.XEngine.Api.Runtime" path="OpenSim/Region/ScriptEngine/XEngine/Api/Runtime" type="Library">
+      <Configuration name="Debug">
+        <Options>
+          <OutputPath>../../../../../../bin/</OutputPath>
+        </Options>
+      </Configuration>
+      <Configuration name="Release">
+        <Options>
+          <OutputPath>../../../../../../bin/</OutputPath>
+        </Options>
+      </Configuration>
+
+      <ReferencePath>../../../../../../bin/</ReferencePath>
+      <Reference name="System"/>
+      <Reference name="System.Data"/>
+      <Reference name="System.Web"/>
+      <Reference name="System.Xml"/>
+      <Reference name="OpenMetaverseTypes" path="../../../../../../bin/"/>
+      <Reference name="OpenSim"/>
+      <Reference name="OpenSim.Framework"/>
+      <Reference name="OpenSim.Framework.Communications"/>
+      <Reference name="OpenSim.Region.Framework"/>
+      <Reference name="OpenSim.Region.CoreModules"/>
+      <Reference name="OpenSim.Framework.Console"/>
+      <Reference name="OpenSim.Region.ScriptEngine.Shared"/>
+      <Reference name="OpenSim.Region.ScriptEngine.Shared.Api.Runtime"/>
+      <Reference name="Nini" path="../../../../../../bin/"/>
+      <Reference name="log4net" path="../../../../../../bin/"/>
+
+      <Files>
+        <Match pattern="*.cs" recurse="true"/>
+      </Files>
+    </Project>
+
     <Project frameworkVersion="v3_5" name="OpenSim.Region.ScriptEngine.XEngine" path="OpenSim/Region/ScriptEngine/XEngine" type="Library">
       <Configuration name="Debug">
         <Options>
@@ -2408,6 +2442,7 @@
       <Reference name="OpenSim.Region.ScriptEngine.Shared.CodeTools"/>
       <Reference name="OpenSim.Region.ScriptEngine.Shared.Instance"/>
       <Reference name="OpenSim.Region.ScriptEngine.Shared.Api"/>
+      <Reference name="OpenSim.Region.ScriptEngine.XEngine.Api.Runtime"/>
       <Reference name="SmartThreadPool"/>
       <Reference name="Nini" path="../../../../bin/"/>
       <Reference name="log4net" path="../../../../bin/"/>
@@ -2415,6 +2450,7 @@
       <Files>
         <Match buildAction="EmbeddedResource" path="Resources" pattern="*.addin.xml" recurse="true"/>
         <Match pattern="*.cs" recurse="true">
+          <Exclude name="Api"/>
           <Exclude name="Tests" pattern="Tests"/>
         </Match>
       </Files>