One of my first parcels in Second Life™ saw the design of a synchronous meeting space. I had no idea who might ever visit my little space to have a conversation, much less did I ever think that seven of ’em would show up at one time. Still, I was prepared
If you sat in a chair, you received a message with instructions on how to operate “your” message board (along with the remote channel on which to submit text, uniquely tied to “your” board).
If you saw a message on another board that you wanted to save (as in: chat log), you could touch that board and the message displayed was written to your chat history. Message saved.
If you were early and wondered where the others were, you could look at the status indicators on the wall and see who’s in world…maybe touch the button to “ping” that user, or—knowing now that they were in world—you could send ’em an IM yourself.