The content of this post was based on Windows Server 2008 R2. However the concepts remains applicable and the implementations are much the same with those in Windows Server 2012.
The ability to deliver a desktop with full fidelity over a network, while deploying applications on demand and with hardware independence, is an IT reality with Windows 7, Windows Server 2008 R2, and Application Virtualization (App-V) which is part of Microsoft Desktop Optimization Pack (MDOP). This screencast highlights how these three amazing technologies work as a solution platform, by demonstrating key user scenarios. Notice that if to implement the VDI solution in a Windows 2003 functional level domain, one must extend the AD schema to Windows Server 2008 level.
For more information, I have also published a number of blog posts and screencasts on Microsoft virtualization solutions including: