I have written a small program similar to the test client that is provided by AspDotNetStorefront to test the WSI interface but with some improvements. Things like the ability to save and load XML files, remember connection settings, provide templates for standard XML messages and a few other things.
If you are interested in giving it a try I am providing it for free as a download from my site at http://www.gfrsoftware.com/wsiclient/.
Windows 8 Native App
I now have also released the first version of the WSI Client as a native Windows 8 App. Take a look at http://apps.microsoft.com/webpdp/app...f-3165279749f9
Feel free to provide feedback and I will use that to improve the program.
Happy Testing.
Gerry