All, I have 3 questions: 1) On an S-Class W221, is there any special key sequence that allows you to get into an Enginnering mode or secret / hiddent menu for the Comand? I was able to access this on a W211 E-Class using the 3-5-7 trick 2) Also, since the Navigation DVD is copied onto a hard-drive, how do I check what version of Navigation I'm on? Do I need to pay a visit to the local MB garage or can I check it from home? 3) Finally, what is the latest Navigation version and how does it compare with previous releases from 2006 onwards? Many thanks.