Hardware ID or Hardware Hash is nothing but a random number generated by the software using an MD5 (or any other cryptic method) message digest algorithm feeded into it by the author. Hardware ID depends on various hardware installed in your system and whenever any of these hardware changes, a new Hardware ID is generated and you need to reactivate your software. The hardware on which the calculation of this ID/Hash depends, varies with software to software.
For example: Windows XP uses 12 hardware identification strings to calculate the hardware hash which it uses at the time of product activation. These Hardware include CPU, IDE Controller, Graphics Controller, Network adapter etc.
Hardware ID is not something that is hard coded on your hardware. It is a random number generated by the program at that very time...so you can't really "find" your hardware ID.
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