From the project website (accessed 2017-12-04):
RoboGreek is a small Windows utility that does not need any installation. Just double-click and the programme starts to monitor the keyboard. Click on the small icon in the icon-tray, or press Alt-0 (zero), and you will start typing UniCode Greek in any Unicode-supporting Windows programme. The keyboard is the same as the WinGreek keyboard, and accents and breathings can be added (details can be found in the programme itself). Press Alt-0 again to turn it off. This means that not only can you type Unicode Greek in Word, but you can send emails with polytonic Greek, or (something I find very useful), type Unicode Greek into Diogenes. RoboGreek Standard works on XP, Vista, Windows 7, Windows 8 and Windows 10.