Left side of the page lists all the rooms you have joined and allows quickly switching between them.
Middle of the page shows all the messages exchanged in the room.
Both of the old chat room sofwares where 3rd party and making changes to them were both hard and time consuming, so we now have created a custom chat software of our own to overcome those problems.
Why do I see the same name in chat room multiple times?
It's about giving yourself the best and most comfortable way of finding them - a way that works for you and your lifestyle.