If this is something that is designed to run "kiosk mode", he can change all the window settings design-time. I've written a number of programs designed to be full-screen dominant, hiding the fact that there's even an operating system running underneath, or an easy way to access it. For things like shop-floor control systems, message-boards being displayed on large, airport style displays, and kiosks, this is just an everyday thing. passel pretty much nailed everything that needs to be done for the basics. Disabling, or making it hard to access the underlying operating system is trickier.