using VB to share files through internet

I am creating a multiplayer game through VB. Right now i am using a "three program" setup, with each player having a single copy of the game running, and a "server" application running to allow each players copy of the game to see other players and trade files between each game copy, versus each copy of the game having to figure out how many other copies are running, etc. I am using a simple "Name (file) as (specific players file location)" in order to transfer files. I have absolutly no idea how to make this work over the internet though. I will have a server and .com though when the game is up, as well as i have basic cold fusion knowledge. Can anyone tell me how to get VB to send files over the internet (in this case, players game copy to server and vice versa).

I would also be very glad if someone could also tell me how to make it so a VB app can find it's location on a network, so other Vb programs can send files to it's location without the user typing in the location of the game as I have it set up now for my beta.