Xen users - Dec 2012 - VGA passthrough over VNC

I''d like to be able to use OpenGL on a remote Windows box (WS2012), so
I''ve been experimenting with Xen for the past few days.  Most of the  
work-throughs for 3D acceleration with Windows that people post/blog are  
for local machines, that is the display is shown on the local screen.  Is  
it possible to forward accelerated video through VNC or RDP with Xen?

Thanks,

--steve