4a6afbed__are_available_for_developers___Notes
[Character] 5 [Description] Erases the user's name and User ID. [Notes] 
Warning! When the device is next synchronized after using this shortcut, the HotSync Manager application thinks that it has never been synchronized before. This means that records will be duplicated unless you first perform a hard reset (press the reset button while holding the power key).
What "hidden" shortcuts are available for developers?
Notes