FireDaemon Zero is an application that runs in the Windows Task Tray that allows a user to easily switch back and forth between their logged-in Windows desktop session and Session 0.

Since the release of Windows Vista and Windows 2008, interactive Windows services (i.e., those with a console or GUI component) have been forced to run in Session 0. The only way to interact with interactive services on Session 0 was to switch desktop via the Microsoft supplied Interactive Services Detection Service applet. This method has a variety of limitations and is disabled in Windows by default. 

FireDaemon Zero is a completely standalone product and a drop-in replacement for the Windows Interactive Services Detection Service. Below is a screenshot of FireDaemon Zero in action!

Switching between logged-in session and Session 0 with FireDaemon Zero