I knew it could be done, but not how. Looks like Gnome has a “gdmflexiserver” command that launchs another login or informs you if another login is already present! This page has a few more details and screenshots.
Zeus has some great icon art too..
The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.