Laptop arrived & dual screens is working a treat using the internal HD4000 Intel chipset.
There is a R7670M as backup if needed, but as the res is only 1366x768 the i5 & HD4000 cope fine with 2 displays.
I was content when I could drag the browser off to the left or right side, but when I realised I could drag it down below the monitor & have it appear on the laptop, which sits below the monitor, it was happy days :)
Now, as for using the laptop as a 2nd display along with my pc I tried the MaxiVista demo. This works over a network & is ok if a little sluggish. Ideal for the PRV display but probably not for using the console.
The only other app I've come across is Air Display, which claims to be faster but there isn't a demo. Does anyone here use it ?