For more information about USB on Macintosh computers, developers should refer to Apple Computer's Mac OS USB DDK API Reference . Information is also available on the World Wide Web, at
http://developer.apple.com/techpubs/hardware/DeviceManagers/usb/usb.html
The Mac OS USB DDK is available from the Apple Developer Development Kits page at
http://developer.apple.com/sdk/
For full specifications of the Universal Serial Bus, developers should refer to the USB Implementation Forum on the World Wide Web, at:
http://www.usb.org/developers/index.html