I was hoping I could use Hangouts as chat-rooms, but it doesn't seem that easy.What I was expecting is that I can bring my Hangout contacts into a chat-room authorized by their hangout ID.  Also all members should have access to all the history of the chat-room.Is this possible?  Is it possible with some other tools?Need authorization by GMail or similar, and good support on different platforms.
Hangouts as chatrooms
chat