And I thought I'd done my research. Thank you so much for these links. I've grumbled to Apple, pointing out that the product pages in their online Store do not give links to these supporting pages, and that their compatibility para is ambiguous. He says he will pass my comments on . . . mmmm.
Meanwhile, a full refund is promised against the returned goods.
That leaves me with a home wireless network still to set up:
PPC G4 (467 MHz) + iMac PPC G3 (500 MHz) + PC (Windows XP, with Wi-Fi card fitted)
How would you network them? Do I have to use AirPort equipment (the 'original' that is, not Extreme!), or can I use non-Mac stuff? A very basic question.
Feeling very confused by it all.
Many thanks for your time and trouble.