The lost instructions on how to make TraceViewer work are below.
Note: to get the application, just download any version of the server and unzip it locally. It doesnt have to come from the actual server.
1.) Open TraceView application under <Server-Installation-Directory>\bin\tools --> traceview.exe
2.) Now go to the Campaign client instance where you are working and press "Shift + F3"
3.) Perform any activity on the instance.
4.) Now go back to TraceView tool and you'll see the SOAP data coming in.
Be aware TraceViewer app is in français only, but a quick google translate will tell you what the options are