Please help my friend!

My friend has the misfortune of his MAC adress (the computer's not the WLAN card's) regestered in his parent's computer (hooked up to the router), so his Mom allows only 2 hours of internet time a day! Can he somehow change his MAC adress or mask it, so he can still use the valuble resourse that is the internet for more than 2 hours? Or is there a simpler way that doesn't require changing any hardware or buying anything?

you know googling is pretty easy

http://www.nthelp.com/NT6/change_mac_w2k.htm