Let's say you have a list of your top 20 customers. Is there any bot or other software that would give you an announcement when one of those customers enters your room silently? It might be nice to just greet them when they enter, but you have to know they are there first. You might not have all 20 userids memorized, and you probably aren't watching the room announcements all the time, so you might easily miss the announcement that they entered.