The Status field in the nested table should show if the user is disconnected. You should be able to search for Active / Disconnected in the top textbox to filter for users in a specific state.
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In your system Information application, under the user sessions portion, I'd like to see whether a user is disconnected. I'm not as concerned about rebooting a system if it's users are disconnected than if they're connected to the console using it.
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