Serial number windows

The number that is in registry of windows.
I want know that data because i should create an application and for security i need that number and others data for example number pc etc
 
You shouldn't be using an OS "serial number" for security. OS changes are made all the time, and that would invalidate your security and aggravate your user. Period. Instead, use hardware-based identifiers, such as a network card's MAC address and/or a hard drive's serial number.
 
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