GRAW DEMO LAN:(

I just found out the GRAW (Ghost recon advanced warfighter) demo has come out. But then i found out its only LAN . I was reallly looking forward to palying this with a couple of friends. Then i remember playing WC3 over lan with friends when i didint have a cd key, with a nifty little program called BATTLELAN. Im not sure how it works, but basically, One of us hosts a LAN game, boot up Battle lan, Host put in the IP of the players wanting to join, sets the ports, I set the ports, I go into LAN in WC3 and i could see his game. Im no Programmer and I'm not sure if anyone reading this is either. Anyone know of a place that has this , or a place where i can learn to make this?