I want to know the answer to the following question:
How does the online Windows installer know which version to install?
All the background I'm provided with is that "The three desktop editions of Windows 8 support 32-bit and 64-bit architectures; retail copies of Windows 8 include install DVDs for both architectures, while the online installer automatically installs the version corresponding with the architecture of the system's existing Windows installation.". Is that enough to answer the question?
Answer: yes