This isn't a secret button, just a result of using Aero on Windows 7, which hides the button. It was actually something that irked me from time to time, becaus

This isn't a secret button, just a result of using Aero on Windows 7, which hides the button. It was actually something that irked me from time to time, because I'd grab a window to move it, only to hit the button and activate the menu.