For terms frequently used in online keyboard chatting, see chat acronyms/IRC/BBS.
According to its home page, the Undernet is the largest network of Internet Relay Channels (IRC) on the Internet. The Undernet interconnects users from over 35 countries for Internet chatting on about 45 servers located on three continents. At any one time, as many as 20,000 people may be chatting on one of several hundred Undernet channels. Users must download free IRC client software from one of a number of possible Web sites and then register as an Undernet organization member. They will also furnish personal Web page space for members.