Press Control, Alt, Delete. Alternatively, right click the taskbar and choose "Task Manager" from the context menu and you'll see the Task Manager. Choose the "Users" tab. It will list users currently logged in!
At the prompt, type: who The output will be similar to: Alice tty1 2010-05-21 15:13 (:0) bob pts/0 2010-05-21 15:57 (:0.0) To see more options of the 'who' command, run 'man who' at the prompt.
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