KillDoom
From DoomWiki.org
KillDoom is a freeware DOS program released on December 11, 1994, by a developer named "Jonny" from Rio de Janeiro. When run, the program would forcibly crash any Doom or Doom II net games running in a given network. According to the text file, the program was created as an utility for network administrators, to prevent employees from playing Doom during business hours.
