How to get the System Hardware key from a java program

Hi All

I am trying to get the hardware key from the System which is unique.I am able

to get the MAC Address of the System,But it won't be useful for my requirement.

I need Some other hardware key which is unique for the system.Is there any java

program to get the hardware key(Except MAC address).

If so i need the related links to resolve this issue

thanks and regards

Satyam