right click "My Network Places" then click "Network Connections" then right click "Local Area Connection" then under the "General" tab highlight "Internet Protocol (TCP/IP)" once this is highlighted select "Properties" then under the "General" tab in this new window check the circle that has the "Use the following IP address" and type in 192.168.1.100 on one of the computers, 192.168.1.101 on another, and 192.168.1.102 on the third one, with 255.255.255.0 as the subnet mask....
im thinking you might have to assign IP's when you go through some routers cause thier cool like that