This simulates an orchestration callrules action from code:
MyArrayList = new System.Collections.ArrayList();
MyPolicy = new Microsoft.RuleEngine.Policy(YourPolicyName);
MyTracer = new Microsoft.RuleEngine.DebugTrackingInterceptor();
You will have to create your facts in here. Use TypedXmlDocuments or custom objects (see the BizTalk help for samples)
MyArrayList.Add(MyFact1);
MyArrayList.Add(MyFact2);
MyPolicy.Execute(MyArrayList.ToArray(),MyTracer);
MyPolicy.Dispose();
System.Diagnostics.Trace.WriteLine(MyTracer.GetTraceOutput());
The aboveline will redirect the traces to the windows event trace.
Use the excellent debugview utility from sysinternals to view the traces.