AFAIK, those are not documented. If you get the Dynamics SDK you might stumble across something, I have on occasion.
Another avenue would be to look at Dex documentation or to ping a good Dex developer (which I'm not), those methods are (I believe) exposed from Dex.
I've made support calls in the past to get the param names for specific methods, I'm always careful to document what I find here but it's not very much.
Related posts:
http://vstoolsforum.com/forums/p/67/137.aspx#137
http://vstoolsforum.com/forums/p/367/843.aspx#843
http://vstoolsforum.com/forums/p/63/121.aspx#121
Please take the time to document what you learn.