Possible to see if other users are logged in? (multi-user mode)

Is there a way to tell if other users are logged in while in Multi-User mode? I occasionally need to switch to Single-User mode and don't want to kick off my clients or other users.

I only know of when first logging in, it shows a pop up at the bottom right of the screen (see picture). I usually just log off and back on, but that can become time consuming and I am not 100% confident it does it for all my clients.