Bluetooth is good for small devices like PDAs and cellphones cuz they don`t load as much web contents as desktops. You can do that if you want, but it`ll be slow:http://windowshelp.microsoft.com/Windows/en-us/help/c4d99703-d2da-4132-acda-7d23815609531033.mspx
If one pc is on internet and you want to share access with another pc or pc`s, your best choice would be a cheap router. 50 bucks or less. MUCH faster speed than bluetooth.