How to hide what you are doing

Hey guys, here i show you my favorite Programm.Its very usefull, when you play or do something at your computer, you shouldn't do. For example at school or at work. So when you think, you want to play, while you are at work or school, activate this programm first. Then a small window will open and you have to choose your hotkeys:Then you get 4 desktops. You can switch between them with the hotkey