On the top right is the list of users and the chat rooms on this server. The toolbar contains tons of commands for tweaking Kali or just setting things up. The top left menu shows active chat servers for specific games, and the lower left menu shows the active games for quick access to join. On the bottom is a quick launch bar so you can get into the games fast and easily. The overall usage is much like IRC, with much more to do, an easier interface for beginners, and no netsplits.
Some services have annual, monthly, or even hourly fees.
Check out their partial-games list here . 205.244.188.24 could play again 205.244.188.102, but not against 153.23.34.123. I think the only exception is Hellfire which no other service supports. At first, I thought Kali was another boring old game network with no potential. Just like IRC, Kali never sleeps.