I configured the nvidia (proprietary, shame, shame) driver on my Dell Latitude D820 laptop so that my video card can display on 2 physical screens at the same time (ideal for beamer overhead display in conferences, or with a spare LCD display on the desk, etc.).
I had only tested the clone mode until now, which is usually used to display the same thing on the flat pannel of the laptop and the VGA output (on a beamer, for instance).
I got a bit further and tested the twinview settings, so that I can have the best resolution on either screen : 1680×1050 on internal display or the laptop (DFP, Digital Flat Panel), and 1280×1024 on the external LCD display (recognized as a CRT by the card). Both screens can then be “assembled” to form one large screen of 2960×1050 known by Xinerama ! And guess what, the window manager manages that in a user-friendly way (more or less) : windows can be transfered from one screen to the other, and magnification only sets them to cover the full of the current screen only.
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