I just found some info on the Microsoft research site. A project called VirtualWiFi. It is a project that allows you to connect your machine to multiple wireless networks at the same time. The quote that I enjoy is that you can play games via one wireless connection and surf the web on another.
I am not sure that would be the reason for using this software, but I can see the value. I would like this feature to be able to test web services, web apps, and security for a product by not being connected to that network.
So far the project is limited in features and does not have WEP or WPA working. But give them time.
you an check it out here. (http://research.microsoft.com/netres/projects/virtualwifi/default.htm)