Is it possible to get setup a multiseat X system with 3d acceleration using fglrx? I have a dual-head Radeon 4670 card.

I'm thinking the Multiview feature recently released would be ideal for setting up a multi-user system with 2 monitors. I found a site, describing how to setup a multiseat system on ubuntu 8.04; however, it uses xrandr and the Xephyr X server to enable multi-seat. They state by using Xephyr, you lose 3d acceleration.

Another site describes how to setup 3d multiseat; apparently w/o Xephyr; however, this solution only works on Nvidia, and only with multiple graphics cards.

Has anyone set up a Multiseat System with ATI hardware and fglrx?