A row marked Here is a visitor whose browser is still checking in. A dimmed row with a time is somebody who has stopped — they stay listed until the window runs out, so this is "recently on the site" rather than only "on it this second". Watch joins that visit as it happens. Not recorded means this session was not picked for recording, so there is no stream to join — sampling and the recording switch are in settings. A dash means the visitor has stopped, so there is nothing left to watch. This list is what is happening now and is not kept; past visits are on Sessions.