What is Unique device id in windows systems?

I am trying to access SystemInfo.deviceUniqueIdentifier . But I am not clear in case of windows system that what is this value ? Will it change if we re-install a window?
If any one has answer please do comment. Thanks in advance.

As outline in the documentation:

“Windows Store Apps: uses AdvertisingManager::AdvertisingId for returning unique device identifier, if option in ‘PC Settings → Privacy → Let apps use my advertising ID for experiences across apps (turning this off will reset your ID)’ is disabled, Unity will fallback to HardwareIdentification::GetPackageSpecificToken().Id.”

I’m going to assume for standalone apps it will default to HardwareIdentification::GetPackageSpecificToken().Id. This value, as stated in the MSDN documentation, is unique to applications within the same package.