PING - The PING command is used to test the presence of an active client or server at the other end of the connection. Servers send a PING message at regular intervals if no other activity is detected from the connection. If the connection fails to reply to the PING message within a certain amount of time, the connection is closed. A PING message may be sent even if the connection is active. Note: This function is not the same as the CTCP PING command.
PONG - The PONG command is used to reply to a PING message. If the server parameter is given, this message will be forwarded to the given target. The server parameter is the name of the entity who has responded to the PING message using the PONG message.
/pong server1.* server2.* - PONG message from server1.* to server2.*
TOPIC - Used to either display the current topic of the specified channel, or to change the of the specified channel to the specified topic, providing enough access is granted on the channel to change it.
WATCH - WATCH is a new type of 'notify' system. The server will notify you whenever a client in your WATCH list connects or disconnects from IRC. Please note, your WATCH list does not remain between IRC sessions. You will need to re-build it whenever you reconnect to IRC.