The type of hardware you need to install in a wireless network will depend on what the scale of the network will be. Though you will almost positively always need an access point as well as the wireless network interface card with it. If you want to install the temporary network between the two computers then two wireless NIC cards are enough for it. If you want to share a broadband internet connection with the speeds of a 512k and above if required by the user. The connection with the Lower bandwidth will work but will not result in slower or unexpected performance.