Xrandr does not support screen size across two screens

[Tobias Kaminsky]

> I don't know any details about Xephyr, but the current stable release
> of the Xserver doesn't allow multihead accross multiple graphic
> adapters. This is a planned feature of Xserver 1.6.

But I am using X across two screens with 2 graphic adapters?
Even mplayer is showing a video across both screens.

Or do you mean something else?

Thanks
Tobi