Supporting DualView (Windows 2000 Model)
Many modern display adapters are able to drive two or more different display devices simultaneously. DualView, a feature of Microsoft Windows XP and later, provides system-level support for features similar to those of Multimonitor, but requires only a single display adapter. The graphics device interfaces (GDIs), and the end-user experiences, are identical for both DualView and Multimonitor.
In SingleView mode, a display adapter drives a single display device, regardless of the number of monitors. This is the usual mode for most of the display adapters that Windows 2000 and later operating system versions currently support.
A computer in DualView mode can use a single display adapter (with multiple video ports) to drive multiple images on different monitors, with each display device portraying a different part of the desktop. The primary image displays the primary view; other images display secondary views.
The following subsections provide more information about DualView: