What is the X in X-mas?
(DCC) An IRC protocol created to allow users to chat privately and to send and receive files directly instead of having to go thorugh the IRC servers. DCC protects users from being monitored by IRC Server operators that have enabled conversation logging. It also allows much more efficient use of available bandwidth as the data does not need to be broadcast all over the world just to reach a specific user.
The available DCC commands include DCC CHAT (direct user to user chat), DCC SEND (direct user to user file send) and DCC GET (file acknowledgement from a receiver).