I found one of the forum posts and it said for the server…
“This is a stand-alone dedicated server application for Frontlines: Fuel of War and will run on Windows XP, Vista, and 2003 Server.
The application will let you host Frontlines servers. The full game, CD key, disc, and registration are not required.”
I am checking for more updates. The post didn’t say which version it was for. I am assuming though that the server is just a pass thru port of some sort?
So I am guessing then that you will only need one copy then in addition to the server files.
Here is a link to the file.
The file is 1.9GB