Here, you can do configurations to the sytem-level parameters.

Visible user IP to moderators
With this feature enabled, moderators can view users' IP.

Enable guest to log in
With this feature enabled, guest users can login without registration.

Enable user to register
With this feature enabled, registration is open for all users. With it disabled, registration feature would be closed.

Save public chat history
With this feature enabled, public chat history is saved for later review.

Save private history
With this feature enabled, private history is saved for later review.

Downward compatibility (restart is needed to apply the change)
With this feature enabled, the downward compatibility would be implemented, that means a high-version chat server could work with a low-version Client in harmony; with it disabled, it can reduce the risk of being attacked by a hacker who may hack in your chat server via low-version Client.