how to use IOKitLib and IOUSBLib to set up asynchronous callbacks when a USB device is attached to or removed from the system is located at:

Another USB Notification Example
................................\build
................................\.....\USBNotificationTool.build
................................\.....\.........................\USBNotificationTool.pbxindex
................................\.....\.........................\............................\categories.pbxbtree
................................\.....\.........................\............................\cdecls.pbxbtree
................................\.....\.........................\............................\decls.pbxbtree
................................\.....\.........................\............................\files.pbxbtree
................................\.....\.........................\............................\imports.pbxbtree
................................\.....\.........................\............................\pbxindex.header
................................\.....\.........................\............................\protocols.pbxbtree
................................\.....\.........................\............................\refs.pbxbtree
................................\.....\.........................\............................\strings.pbxstrings
................................\.....\.........................\............................\..................\control
................................\.....\.........................\............................\..................\strings
................................\.....\.........................\............................\subclasses.pbxbtree
................................\.....\.........................\............................\symbols0.pbxsymbols
................................\USBNotificationExample.c
................................\USBNotificationTool.xcodeproj
................................\.............................\dragon.pbxuser
................................\.............................\dragon.perspective
................................\.............................\project.pbxproj

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