You mean as one extra-wide, combined screen? Yes.
The laptop has Win 2K on it, so setting up to use both screens works fine. The Taskbar at the bottom starts on the laptop and extends onto the Flatron, so the Time and system icons are in the Flatron's lower right hand corner, and the 'Start' button is on the laptop's lower left hand corner. We've tried numerous options to keep the Taskbar limited to only one LCD panel - nothing works.
Of course, one of the other contractors has Win XP on his Thinkpad, and his Taskbar fits just right on the laptop's screen while he uses the Flatron to keep open Outlook and MS SQL Server Enterprise Manager. That's the setup we were trying to replicate.