Uses the Rage Mobility 128.
The hardware supports simultaneous use of the built-in screen and an external screen with different displays on each screen. This is supported in Windows 98 and ME, but not in many of the other versions of Windows.
In Linux, for $120 you can use Accelerated X for Dual-view support. Only the Silver and Platinum versions support dualview. XFree86 doesn't support dualview out of the box, but support is being worked on. Please help by beta-testing the new XFree86 drivers.