I have a PowerBook G4 baught in france and it has a AZERTY keyboard. I baught the Apple Wireless Keyboard which is QWERTY but set up automatically as AZERTY when I installed it. I can't find where to change the set up for it to become usable.
Open the International pane of System Preferences, click on Input Menu, and change the settings so that the Input Menu appears in the menu bar and contains the desired keyboard layout. Choose that layout from the list; you can then turn off the Input Menu if you want.