The Windows Key is that nice button on most keyboards with the Microsoft Windows logo on it that when pressed brings up the Startmenu. Now, there is a button combination that has the exact same effect and can be used on systems where there is no windows key. Sometimes Kiosks are made this way. So, if by chance you need an alternative. The combination of CTRL and ESC will bring up the Startmenu exactly the same way the Windows key does.