Thanks!

>Alternatively you can use CPU ID. Hard Disk Number Volume Serial Number is also an other option, but the Volume serial Number Changes when you format your Hard Disk.
>
>So the best way is to use combination of CPU ID And MAC No. In absence of MAC no you can proceed with CPU ID.
>
>
>
>We are using the mac address to identify the client machines on a network.
>>However now that they are using some Windows 7 terminals, and they are using some wireless device, it seems that those machines do not get a mac address. At least our code does not return any value.
>>What is the second best way to identify a computer, the only important thing is that this computer must generate the same key each time and it must be unique.