> I have tested a VirtualBox VM and was very happy with both fullscreen
> mode and seamless mode (windows of the guest exist right alongside
> windows of the host).  The problem I ran into was I want to configure
> this on boxen with two monitors, using extended desktop.
> X seems to have a problem with this (I used xrandr to extend the desktop).
> I didn't really expect fullscreen mode to work across both, but the
> windows of seamless mode won't drag onto the secondary screen, either.
> Is there some linux command with nVidia drivers (like nView) or ATI
> that will extend the desktop in a smart way that will allow me to work
> with a guest OS across both?  Or in a related note, is there a
> solution (or a technically possibly solution) using the VBox SDK?

How much testing have you done to try to narrow down which component
is at issue?
* video card driver
* X server
* window management and/or desktop environment
* VirtualBox application
* guest

While i haven't thought through all details of isolating which component,
here are some thoughts on a start:
* do you have any different hardware with which to test?
* test with GNOME, KDE, FVWM, and maybe other.
* is there any other native virtualization utility with seamless mode
  feature, that can be compared to VirtualBox?
* test with different guest OS & guest applications.

Another thought, you might cross-post this question on LUG*IE,
which had a presentation on VirtualBox early this year:
 http://rd-foerster.com/LUGIE/jan2010.htm

HtH / Randall

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Randall Whitman
www.whizman.com
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