C# Service to Enforce Tray App is Running

I have a tray application that I want to make sure is always running in each of any number of interactive sessions in Windows. I think a service should be able to accomplish this. Here is a pseudo-code (I don't now the actual APIs or their requirements): string trayapp = "c:\\[login to view URL]"; While(!ServiceIsStopping) { ? ? interactiveSession[] sessions = enumerateInteractiveWindowsSessions(); ? ? Foreach(interactiveSession s in sessions) ? { ? ? ? ? if() // if tray application is not running in session ? ? ? ? ? ? ? ? Spawn(trayapp,? s); // spawn the tray application in session s ? } ? [login to view URL](1000); // Pause one second between checks } I did find a program at? <[login to view URL]>? that enumerates sessions (including interactive ones), but I have not found anything yet that allows a service to spawn an interactive application within a specific session, so coding this is probably the bulk of the challenge. ## Deliverables C# executable to run in Windows 2000, XP, 2003, Vista, 2008; and compiled in Visual Studio 2005 or 2008.