DebugView is used to view trace messages output by an application on Windows. (get it from:http://technet.microsoft.com/en-us/sysinternals/bb896647).
Once you have downloaded and have DebugView running, you need to instrument your BizTalk process to perform tracing. The easiest way to do this, is to insert an Expression shape onto your orchestration and add the following code into the expression:
In DebugView, make sure that you have capturing enabled for Global Win32 (“Capture” ==> “Capture Global Win32”). When you start the capture, you should see trace information.