Each room you enter has a room chat, so you are only chatting with those people you can see in the room. Type your text and press enter to send everyone in the room a message. As you move from room to room, you will be able to talk with people in that room. You can invite a person to a room with no one in it, to have a more private conversation. Use the chat window to control pavilion interactions using a series of / (slash) commands. 
Broadcasting turned on for all conferences attendees right now, you can broadcast to all rooms by using the one of the many slash commands. Slash commands use the "/" key with a string. To broadcast you can use /b to send you message to all rooms.
You can use the /pm command to send a private message to a user eg. /pm userid message.
Find Users Online You can use the /who command to see everyone who is currently online .
See who else is in this chatroom /who /who chatroom.
