Windows 7 has Virtual WiFi support

You might be wondering why anyone would ever need multiple WLAN adapters on the same PC, well to be honest, you don’t need but its sometimes good to have. In any case where you’re connected to an existing wireless access point and want to connect to another network whether that be a separate access point or even set up an ad-hoc connection, Virtual WiFi will allow you to do just that. But perhaps the scenario that is more appealing is the idea of a mesh network. In a mesh network, every client becomes a repeater, growing the network organically as more clients connect. Virtual WiFi enables this, since every client can become an access point too.