Yes, I've used Voodoo3 and CV64/3D at same time on my a1200 (ZIV+MediatorZIV). And I have also AGA display on TV, so I can play games or watch demos from it while WB & other stuff is visible on monitor.
We had once two PicassoIV:s on our university's a4k and played dynAMIte with two monitors and two joysticks and one computer
