VDI, Microsoft, Citrix, Quest. XenDesktop vs vWorkspace


I was wondering about Microsoft Windows 2008 R2.
I like VDI, but I need than the ThinkClient was transparent. That is,
The user is a poor technology user.
Citrix and Quest install a plug-in in the ThinClient.
I dont know this plug-in in MS W2008 R2.
With this plug-in, the user only use the VDI. The window in the ThinClient is transparent for him/her.

What is the best VDI broker?

This is my picture in the Citrix Lab.