Hi,

>>"groups" sound fine to me.
>>
> What is the difference between a group and a role other than name?
> While it makes sense for someone to activate and deactivate a
> particularly role, does it makes sense to temporarily leave a group?
> What sort of privilege would be required to register another user for a
> group?

I can't talk for Martijn, but maybe the difference between login with rolename and don't use a role
at all by login.
The group "binds" the role(s) to an user, thus the client needs only an username and password to
login.

Regards,
Arno Brinkman
ABVisie

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