Not sure about wifi but with mountain lion you can network using bluetooth, from apple
"Bluetooth lets you make short-range wireless connections between desktop and portable computers, mobile phones, headsets, printers, digital cameras, keyboards, and even a computer mouse."
"You can wirelessly transfer files between computers—even Mac to PC—using the Bluetooth File Exchange utility. You can even browse selected devices and retrieve files remotely. For extra security, you can stipulate that only trusted devices be allowed to connect to your Mac, and 128-bit over-the-air encryption is also available."
Link to the full article found below.