There is a brief section about both TCP/IP and PBEM in the manual on page 6-7. The TCP/IP portion is a bit lackluster but the PBEM is very helpful. I think it mainly has to do that Illwinter can't know what type of settings you have for your computer or internet connection and chose the path of least resistance when coming to explaining it; hoping that people would know about their IP addresses, firewall problems, router issues and the like.

Though in the end I had to find the thread located here to host and serve on the same machine, which would have been a great inclusion.