While setting up the new iMac, I’ve been able to establish dynamically-assigned network addresses on an 802.11 wireless network, integrate its networking with both the Macs and Windows machines at our home, install specialized drivers to integrate with a third-party outboard USB audio interface, and use a third-party USB/Serial adapter to provide backward-compatibility with my old GPS unit.

One question remained, however, which Apple has now thoughtfully answered for me. Thanks, Apple!