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DrDoc - 9:37 pm on Mar 28, 2006 (gmt 0)
It also depends on the video card, whether you have only one or two ... and (if one) whether it is capable of treating both monitors as one single desktop internally.
Actually ... Just did another test. If you have it set to allow windows to span the two monitors (thus maximizing over both monitors instead of the normal one) it will show the combined total, which in this case can be completely different than the two resolutions combined, as it will take into account dead space from adjusting the desktops height wise.