You probably have Win machines. If so, get a little network hub and plug them into it. Make sure they are both set to the same workgroup so it's easier to navigate between the two of them. This will allow for easy internet sharing too. Sharing your internet connection will depend on your router and if it's capable of providing DHCP (dynamic host configuration protocol. That means the ability to dynamically assign IP addresses without you having to acquire additional IPs from your ISP). You should be able to get everything hooked together for less than $50.