Well, I thought I answered Tesco's question, but if I have confused anybody, I am sorry. Let me try again...
If the game is originally started in TCP/IP mode it
can be moved to PBW/PBEM, and back again.
But,
If the game was not started in TCP/IP mode initially, it
cannot be converted to TCP/IP mode.
Does that make more sense? If it doesn't, you may have to take my word for it for now. Once you have the Gold Version and see how TCP/IP games are setup and saved I think it will make more sense. It's kind of like trying to describe the elephant from seeing the tail.
Geoschmo