roles vs. usergroups

hi list,

after reading some mailinglist entries and some doc. it seems roles are 
the better usergroups

the rolemember can changed afterwards (what is not possible with 
usergroups without deleting that user)

the user can be member of more than one role (is this true)

the rolepermission can get activated by the user later with a rolepassword

my problems and questions:

1. where can i look, what roles exist? (why arent thy listed under users 
in sqlsto? or in the users view)

2. where i check what members a role has?

3. who can i add a user, usergroup or an other role to a role? i didn't 
find the appropriate doc page.

4. to elke: i was unable to find the discussion how permissions to all 
tables can get set by a script. have you more information for me, to 
find this.


greetings
thomas

p.s. if i forgot some important (dis)advantages from usergroups and 
roles or if some information are wrong, please correct me.

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# Thomas Stegbauer
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