Unlocking your Windows Phone for development

It is not totally obious how to unlock your WP7 device for development. The first step is of course to sign up for the development program at http://create.msdn.com. But then? I had the exact same experience as this guy:

http://www.pitorque.de/MisterGoodcat/post/Unlocking-a-Windows-Phone-7-device-for-development.aspx

So together with the SDK a small activation program was installed, “Windows Phone Developer Registration”. Start it and login to active your device!