> You can always use Xinerama which is built-in to X.org, but I think it
> only works with two cards.
One thing that Xinerama also works with is Xdmx [Distributed Multihead X].
It allows one to use remote X screens as an extension of one's main screen,
even Windows machines running Xming. It was originally [AFAICT] designed
for creating video walls, but is great if you've got some old laptops
sitting around doing nothing.
If you're going to use it, I suggest you reconfigure XFS on your main
machine to accept remote connections from the slave screens to avoid
tedious problems with fonts not being the same on all hosts.
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