mIRC is a free program that connects to IRC where you can select the server you would like to connect to, and then continue to join chatrooms. Some other programs offer this such as Opera and Trillian but as a bundle. Opera being a web browser has this feature installed, and Trillian is a program where you can connect to a few popular chats at once in a single program.
Concerning the slang "dunno", it probably came from people saying don't know (don't know is short for I don't know) pretty fast so it merged into don'tknow, which sounds like sort of like the pronounciation of "dunno".
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