Originally posted by Kodai:H:BH is designed for A) IPX network play and B) direct conection via dialup modem. With option A), you would have your own network and clients on that network with H:BH installed could then link up and play. This is not the same as TCP/IP internet. H:BH does NOT have the ability to resolve an IP address. The game was designed and released before most people started to game over the internet. You may be able to make this game work over the internet with a 3rd party app called himachi. Himachi has the ability to like two systems over a private, virtual IPX network. This is what most people use for older games to continue to play with each other.Option B), is for directly calling another persons computer via a dialup modem. One modem is set to "originate" and the other is set to "answer". Both players start their game and one person calls the other from the simple in game multiplayer screen. The other player's modem answers the call and the games sync up and allow basic chat functions. While USB modems are still fairly cheap and easy to find, they are not intended to function in a MSDOS enviroment. H:BH is a pure MSDOS game. When you run on a moden machine, you are running it in a emulator creates a virtual MSDOS environment. To be honest, I have no idea if a modern USB modem would work in something like DOSBOX that this version of H:BH comes with. My guess is no, it won't. I would again recommend himachi for multiplayer.Now if you and a friend have or have built a retro PC (aka a "time machine" to many retro players), then you should be able to take your copy of H:BH from steam, move it to the vintage machine and use the modem that way without ny issues.Hope that info helps.