[xwiki-users] Permissions for the bottom Xwiki panel??

Hi, is there a way to give user permissions on the bottom panel that has: Annotations Comments Attachments History Information in it?? What I'd like to do is give read/write permissions to all signed up users and then deny all other "guest" users access so that if a guest goes into the site the panel doesn't even show? I'm using the toucan skin and have found this which is too dramatic as it disables the the comments panel altogether: http://www.mail-archive.com/users@xwiki.org/msg00864.html I tried searching under the Panels home but couldn't find any names correlating to the above panel..... also. Thanks, Kaya