Having a window open in one corner means that in a sense they are logged in because that window is open. They are participating in that community by sitting quietly in it. Every once in a long while someone will say something. It does this. There will be a long pensive silence lasting a few minutes or perhaps an hour or more.
Nobody logs out, nobody changes.
They go back to sitting there again. It is very quiet. We all know each other very well. We know our habits. We don't really have to explain them to each other.