Windows 8 is elegantly designed such that its themes fit perfectly onto a dual monitor setup.
So if you are using dual monitor setup you might right away test Windows 8 theme features for yourself .
But you gotta see to it that both the monitors are using the same resolution.
Some would even like their second display to work as an HDTV.
you might also watch a YouTube video, which shows Windows 8 on a Dual Monitor PC.
There are more YouTube videos which explain into the details about setting up multiple monitors for your PC.
Hope you like the Windows 8 dual and extended monitor support for your present configuration.
If you think you need more support c’mon mention in the comment section.