I have a wireless network setup with iMac and MBP. Printer is hardwired to the iMac. Using a separate MBP and printing, I have to make sure the iMac is on and awake. I have a different printer (multifunction with fax etc.) that is not wireless compatible but does have USB. Somewhere I've heard that an Airport Express can be attached via USB to the multifunction printer and somehow integrated with the 2nd MBP. That way, the iMac wouldn't have to be on to print thus bypassing the wireless network. Is that true? What are the basics of the setup? Thanks.