Some docs help

I'm currently writing up some documentation about using LiveUser for  
other developers on my team. I think there's a good chance I can  
contribute these docs to the project.

In the meantime, I would appreciate some help filling in the blanks.  
Some simple questions follow:

In the table liveuser_perm_users, what is the purpose of the fields  
auth_container_name and perm_type? auth_container_name would seem to  
be something to do with the source of authorization for the user. But  
since the authorization system-specific info about a user goes (I  
understand) in liveuser_users, I can't fathom what this field is for.

What about owner_user_id and owner_group_id in liveuser_users and  
other tables?

What is the purpose of liveuser_groups.group_type?

Many thanks.

Guyren G Howe