nbnetd
nBlizzard
Entertainment (a game software company) puts out a beta test of Warcraft
III
nW3
talks to Blizzard servers for on-line multiplayer games
nThe
Blizzard servers authenticate software copies when the user logs in (looking for infringing
copies...)
nThe
servers were slow, so some enterprising folks reverse-engineered the protocol and
started running their own servers (bnetd servers)