Go play that game or share files, music, or videos though the network and sharing center.
Every want to play internet games with your friends on the same network but there is no internet around? Most games let you play with just the people on your network. This will show you how to set one up even if there is no router around. You can make your own network allowing people within 30 feet of you computer to join the your network.
Step 1: Start
Go to the bottom right of your screen and select the icon for wireless networking then open the network and sharing center.