Q: How do I get back into a channel I have already been to in this session
A: On the right hand side of the chat screen there is a list of rooms you have been in during this session you may click on any of these rooms and you will see what is being talked about in these rooms i the chat pane. With Java it has a restriction you can be in several rooms at the same time but you can only see whats being typed in only one room at a time. You can switch between rooms as often as you wish. You will not miss any conversation by being out of the room for a short period of time