Fail mk. 2
As I commented yesterday, VDI == Virtual Desktop Infrastructure, which is VMware's term for a particular virtualization approach to serving up virtual desktops. Admittedly, the acronym for virtual desktop, VD, leaves something to be desired. Here's a hint:
http://www.google.com/search?hl=en&q=vdi&btnG=Google+Search&aq=f&oq=