I will be covering setting up a dual-boot via VHD in my next article, but wanted to cover the standard method first. Booting from a VHD is only allowed in Windows 7 Ultimate and Enterprise.
Funny how "Perquisite", slipped in as a typo, but it is actually a word meaning the same as a perk or a customary tip or an exclusive right.
I'll have my editor change it to "Prerequisite."