Unique ID for ALL Machines in the World

Hi All,
I have made a client-server application.
The server is the servlet implementation and the client in Swing application.
When client gets installed, it has to send the unique ID to the server for registration. I call it Activation Process.
My problem is how to get the information that will be unique across all the computers on the earth.
Can anyone tell if i can use any system information or something that java can do itself?
Thanks in advance.
Hoping for a favorable response.
Kind Regards
Chetan Chandarana

Hi,
Well I agreee for using MAC address. Thats the different issue of finding them using Native methods.
But what about the machines those are at home and does not have the Network Card ??
Thanks for ur reply.
Kind Regards
Chetan Chandarana

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