“The hardware part of our dynamic duo comes from Matrox
(http//www.matrox.com), which recently released a graphics board,
the Millennium G400, that directly supports two monitors with a
single card. The software portion is the dual-head version of
Accelerated-X from Xi Graphics (http//www.xig.com), a company that
makes several commercial X servers for Linux, Solaris, and
FreeBSD.”
“Using these products you can get what the fans of
multi-head computing call SLS (single logical screen) operation
with KDE, GNOME, or any other graphical Linux desktop environment.
In an SLS configuration you have one logical screen that just
happens to be displayed with the help of more than one physical
screen. This means you can grab objects with the mouse and
move them from screen to screen, and resize windows and dialogs so
they split across physical screens. Your desktop still fully
supports virtual desktops, of course, but this way you get two
screens per virtual desktop.”
“This configuration works quite well with both KDE and GNOME,
largely because they don’t know it exists. The support for the dual
screens is at a low enough level in the systems architecture that
it’s “below” KDE, GNOME, and your X applications. All they know is
that you have a single screen of a given size; they’re oblivious to
the fact that you’re viewing it via two physical monitors.”