There is no Win 7 emulation built-in to Win 8, it's possible the Technote was talking about Win 7 compatibility?
The page you linked to has nothing directly to do with Win 7 emulation. It's referring to Hyper-V which is a feature of Windows 8 that allows you to create and run virtual machines. A virtual machine is a fully functional machine but it is implemented entirely in software and runs as a program on your physical machine. With Hyper-V, you could create a virtual Windows 7 machine but you need to install Windows 7 from an install disk in order to do that.
Hyper-V isn't installed by default, it needs to be added via the "Turn Windows features on and off" function of "Programs and features".
Hyper-V requires you to be running 64-bit Win 8 Pro.
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