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..
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Awesome! I wish I knew about this sometime ago. It did scare me when I first ran the command. I thought I got kicked from the original session.