Is it possible to reset a registry value to its default?

Tech-Archive recommends: Speed Up your PC by fixing your registry

Hi,
I am curious, whether we can reset a registry to its default value.
Assuming that my application is looking at a registry value[under one
of the system's keys under hkey_localmachine], and My application
doesn't know whether it has been changed by somebody or some other
applcation before. Now, at this point, is it possible to find out the
actual default value? (programmatically!)

Thanks
Sathish

.

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