DCC Chat is a dedicated connection between two computers, so in a chat can participate only two people at a time. DCC Chat isn't Yahoo! Chat, to "invite" more people to the same chat session; that is done through creating your own channel and inviting your friends to chat there simultaneously. I'm sure one can create a script to open several DCC Chats with several nicknames and "group" them in a common discussion (displaying to everyone else what someone has said), somehow like a "partyline" in an eggdrop bot, but this is not how DCC Chat is intended to work. Simplest solution for you is to create your own temporary channel, make it secret and invite-only, and chat there with your friends; channel will be deleted when everyone leaves.