FYI, for other games there is a software [commercial sadly, but I bought it!] called TCPCom that allows any game that can use “Null Modem” to work on a TCP-IP network! Of course, you can only play 1vs1 🙁 but it works flawlessly!
Also, do a google for the Hi-Resolution patch for C&C Gold – Tiberium Dawn [the original Command and Conquer] at 1024×768 is awesome!
Due to missing IPX in Vista/2K8, its was not possible to play with your friends on LAN. But I’ve discovered an UDP patch for C&C games, that use IPX. IPX is replaced with UDP protocol, and the multiplayer runs a bit faster, too.