Some people say yes some say no.. (I think it depends on your app and monitor from what I have read) I havent tried it.. I do know it only has HDMI output for a monitor so your monitor at least has to have HDMI for it to even possibly work without any adapters
What D said. I have hooked it up to my tv via HDMI but had never done dual monitor before so I looked it up on google. all I had to do was drag the window I wanted on tv all the way to the right of the screen and it continued dragging to the tv! I was able to stream the Sony E3 presentation without any hiccups while surfing on the chromebook screen!