I apologize in advance for what may be a stupid question. I am about to order my first apple laptop, an 11" Air with 1.7,ghz 8mb, and 512 flash. I am curious if I need the external drive. If i have a 27" iMac can I hook an Air to it if I ever need to load any dvd based software onto the AIR? I don't need a portable drive, I am just trying to figure if I can use the iMac and just save a program to the Air easily? I spend 10hrs a day on a PC, and my apple computer knowledge is a bit light.