Game to run in background and desktop messages?

Many of us seen games and programs to run in background on launch or when the OS had been booted( Steam, Antivirus etc etc), is it possible with unity3d to make the application closed, but still running in background, and also show desktop messages? any ideas.

You would be better off asking this in the scripting forum. I am curious, however, what are you wanting to use this for?

The short answer, of course, is that if the program is running (doing anything), its not closed. Just because my email program isn’t currently in my face, it’s still running (I can see it running in my task bar, and I can shut the program down if I’d like).

I understand what you mean. Just saying, don’t make the fundamental mistake of assuming that its functioning while the application is closed.