Minimal number of groups for unprivileged user?

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https://bbs.archlinux.org – Hello,I'm trying to add an 'underprivileged' user to my system who can be used for downloads from unknown sources in the web etc. I made a new group (www) and a new user (called www too), who has his own home directory. Now I want to start my webbrowser (in my case conkeror) as www, but receive the following error message:     [www@arch www]$ conkeror    No protocol specified    No protocol specified    No protocol specified    Error: cannot open display: :0.0So what are the groups I must add the new user www to to enable him to (HowTos)