Port Authority2 USB 2.0 to XGA Adapter. Extending your desktop has never been easier with the Port Authority2 USB 2.0 to XGA Adapter! Install the included software, plug in the adapter, and you are on your way to dual monitor computing. Now you can easily expand spreadsheets over two monitors, read e-mail on one monitor and view the attachment on the other, make multi-screen presentations without a second computer, or expand your graphics workstation.