how to know the event by looking at /dev/input/by-id

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http://unix.stackexchange.com – I want to access the keyboard device driver,I usually accesses it by looking at /dev/input/by-name but the event provided by it gets changed every time logs in,and after searchin on net I found that this problem can be removed if i use /by-id but I am unable to find any device there in that folder. Thanks. (HowTos)