Orient yourself to the weatherboards you'll be working with: the board you're replacing, the board immediately above it and the one immediately below it. Call the board above the one you're replacing board A.. Board B is the board that you're replacing.
Desktop virtualization is the concept of separating the logical desktop from the physical machine. One form of desktop virtualization, virtual desktop infrastructure (VDI), can be thought of as a more advanced form of hardware virtualization.
tl;dr - Virtual Desktop Infrastructure (VDI) hosts virtualized desktop environments for users in a centralized system. What is VDI? Imagine not having to carry around a laptop or be sitting in a cubicle to access your work desktop applications.