I have an iMac, MBP , and Airport Extreme. The HP printer that I have is hardwired via USB to the iMac. If I understand correctly, I should be able to set up the MBP to wirelessly print to the HP printer via the Airport Extreme. Is that true? Would the iMac have to been on and if so, can it be asleep? I have a couple of Windows computers as well. Can I set up a Windows XP, Vista, or 7 computer to print wirelessly via the Airport Extreme? If the above can be done, does anyone know how to set it up? Thanks for the help.