Believe it or not, our SDK contains quite a bit of information about what Windows Mobile uses certain registry keys for.  To see this list, install the Pocket PC 2003 SDK and look up “Registry Default Metabase Settings” in the index.  There is a link on each item in this list which takes you to a page listing the default security settings for that key (subject to customization by OEMs and mobile operators).

[Author: Robert Levy]