Probably both. See this discussion on device ids (from linux-hotplug-devel):
http://www.geocrawler.com/archives/3/9005/2001/9/0/6716219/
http://www.geocrawler.com/mail/thread.php3?subject=IDs+%28was+Re%3A+Hotplugging+for+the+input+subsystem%29&list=9005
bye...
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