IFrag (ver 2.10) Abandoned Freeware IFrag allows the gamer to play the DOS versions of Doom, Doom2, or Heretic as a Distributed Interactive Simulation over a LAN or the Internet, with as many as 4 opponents/cooperatives. You must have a network card with appropriate drivers. IFrag uses WATTCP. You must configure "WATTCP.CFG", "IFRAG.CFG", and if you are the host, "DEFAULT.RSP". Note: Although the listed Trackers appear to be no longer functioning, you can still host your own game over the Internet.