https://en.wikipedia.org/wiki/Internet_Relay_Chat#Clients
https://howiezhao.github.io/2018/09/12/what-is-irc/
http://www.csun.edu/~webteach/mirc/commands.html
https://www.wikihow.com/Get-Started-with-IRC-(Internet-Relay-Chat)
https://cloudsjhan.github.io/2019/04/19/IRC%E5%B8%B8%E7%94%A8%E5%91%BD%E4%BB%A4/
https://wiki.ubuntu.org.cn/IRC%E5%9F%BA%E6%9C%AC%E5%91%BD%E4%BB%A4%E8%AF%B4%E6%98%8E
https://www.mirc.com/help/html/index.html?basic_irc_commands.html