Websockets Rooms

Since Wappler version 3.8.2, Sockets have received advanced features. In several training articles, Teodor outlined how to use functions such as Emit / Direct Message / Broadcast / Socket Identify

However, there is no information in the documentation on how to use Join Room / Leave Room / Get Joined Rooms / Get All Rooms

I would like to get a description of these functions at least in general terms. When and how does it make sense to use them in a Wappler?