for the login box yes, but he alteredit much more than that
i find a way for anonymous by editing the "<!-- BEGIN switch_user_logged_out -->" in indexbody
but the hard part is to display some infos for register users, not seen by anonymous.
edit => i think i've found what to do : just wrote a new part in indexbody.tpl with ""<!-- BEGIN switch_user_logged_IN
there is allways an "assign_block_vars('switch_user_logged_in") in pageheader.php.
seems to work well like that.
i just have now to modify index.php and assign new vars in $template