Hide that game you are playing or that website you are on when you are supposed to be working. Or, you could just use it to clean up your task bar by hiding the windows youТ‘re not using. It does not need to be installed so you can run it from your memory stick or you could put it any were on your hard drive.
Hide Windows with one press (has HotKeys)
You can manage windows and processes
Add/remove programs from running at login (from window manager)