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1 chat room
A data communication channel that links computers and allows users to send messages to each other in real time. Chat rooms are available through online services and some electronic bulletin board systems. -
2 secret chat room
"In the Lync persistent chat feature, a room that has been set up with the most restricted level of privacy. Only members of a secret chat room can find it, see who is participating in it, follow it, or read and post in it."