With the original Ghost Recon you can of course play IP to IP, simply enter the IP address of your friend who is hosting and you can join through the Multiplayer window.

Of course this screen is not a game browser in the normal sense of the word and only lists games IPs you have already manually entered.

To browse public Ghost Recon servers you need a tool, and their are two you can try.

http://www.gameranger.com/

http://www.voobly.com/

Both of these game matchmaker clients work woth Ghost Recon.

Also, remeber you can use our Ghost Recon Forums to find people to play Ghost Recon with.