I have an app that runs on Windows 7 using Microsoft\'s Layered Window http://msdn.microsoft.com/en-us/library/ms997507.aspx. This app is setup to have a 30% opacity, it\'s
Run the windows speech recognition. Its a top most window which floats over start menu, desktop etc. So its possible for sure. I am working on a touch simulator for Windows 8 and needed to implement this feature.
Here are the steps to achieve this:
http://www.pixytech.com/rajnish/2013/05/windows-8-topmost-window/