multiple wireless keyboards

Hi guys/girls,

We just bought a new iMac with the wireless keyboard. The problem is I need my keyboard in another format (my wife uses this azerty one) so I plan to buy a normal US-qwerty wireless keyboard. Do you know if it's possible to use both wireless keyboards at the same time (I mean without having to disconnect either when you use the other one).

Thank you all for the help.
Dolf