/me In the beginning of a sentence, this command will be replaced by your username (ex: /me eats a delicious pizza" will display "Nickname eats a delicious pizza")

/exit Disconnect from the Chatbox. You can also precise the reason that will be visible for all members connected (ex: /exit reason)

/abs Send a message noticing that you're absent. You can add a reason that will be displayed in the message and visible by all members connected to the Chatbox (ex: /abs reason)

Enjoy.