See the console as
Which access point is in which room
When the collector sends counts from an access point Occupi doesn't know, they wait here until someone places it, so nothing is lost while you find out where it is.
Placing one brings in the readings it sent while it waited. Readings from ignored ones are dropped as they arrive.
Its name points to A001.
It fills up and empties with A002's classes: a close match over the last two weeks.
Too new to tell from its crowd yet. Give it a teaching day, or pick the room yourself.