Windows 64-bit registry v.s. 32-bit registry

Question

I heard on Windows x64 architecture, in order to support to run both x86 and x64 application, there is two separate/different sets of Windows registry -- one for x86 applica

Answer 1

They aren't separate registries--one is a subnode of the other, and the OS does virtualization to make sure that 32bit apps get their keys and 64bit apps get their keys.