In other words, if you make it a windows application, but don't create a window, it will be really hidden! The task name will show up in task bar, but there will be no visible widnow. Now, the soapbox. The Kodak EasyShare shoftware does this crap. And, every time I go to shutdown my wife's Windows XP box, I get a warning about "user has 1 program running you could lose data .. blah blah blah..." and this is very annoying, because an INEXPERIENCED user would be scrathing their head trying to figure out where is the G_____N app that is running?? So, I would also encourage you to diligently process any notifications or other events (difficult if no window..) that he system would send you regarding shutting down or logging off. No shirt, no shoes, no brains, no service.