The chat rooms have really interesting features, like pinning and rich-embedding equity information that updates in real time. Also, you can "ring" the room with a bell, which was immensely entertaining as an intern.
If the price moves against you since you last quoted, you typically say something like "off" and ring the bell so that the other guy knows that price is not good anymore. Fairly relevant when you're talking to a salesguy who is not looking at the chat, cause he's talking with his trader