you can get a wireless router with a modem built in, most have several plugs so you can use an RJ45 to hard wire some machines. All the machines can work independantly and do not require one be left running. You will need to fit wireless adapters to each machine to receive the signal from the router. You can network your machines if required. This is a simplified explanation, the actual requirements will vary from site to site. You will also need a broadband service from somebody. Suggest a GOOGLE to have a look at hardware, I have a BTVoyager 2100 with PCIadapters in 2 machines and a USB adapter in one, if you can I would avoid the USB adapters and get a PCI with a remote antenna.