Device Node and corresponding device

I have multiple usbdux devices connected, when removing one of them I want
to run a usb hotplug removal script in which I call "comedi_config -r
/dev/comedi[devicenr]" for the specific device only.
 I need to find out the specific device node nr of the device that is beeing
unpluged, in order to avoid having to remove all devices and then
re-register them again.
 This could also be usefull when connecting a new usb dux and there by only
calling "comedi_config -i firmware /dev/comedi[devicenr] usbdux" once
instead of calling it multiple times, once for each device as in the current
/etc/hotplug/usb/usbdux script.
 How and when does comedi/usbdux bind a newly connected udb device to a
specific device node in /dev ?
 The scripts to call when recieving an usb add or remove event are defined
in /etc/hotplug/usb.agent
 /Kristofer Hansson