Supports Wireless Access Points from Broad Variety of Manufacturers
Sounds like you still need the hardware and your PC can act as an intermediary access point. So with the other software too, you are using a wireless access card.
I understand what you are referring too, its just that w/o a way to receive the signal it cannot be done.
Kind of like a software cable modem. There needs to still be the interface connecting it to the network, so it is not possible.