A friend of mine just switched from Windows and bought a new MacBook Air. I'd like to help her set it up with a number of online services, forums, etc, but I don't have wifi, my iMac is directly connected to the modem with an ethernet cable. Is there any way to share my internet connection with her computer? I've never even seen a MacBook Air, but from the pictures on the Apple Store there's no ethernet port. Maybe connect hers as a bluetooth device? Can we connect through USB or Thunderbolt? Or is wifi the only way to get an Air online? Thanks for any help!