Actually I’d tested that kind of device.
Here are my test experienced:
1. Clip it on(Rx)laptop (Windows XP, Vista and Windows 7).
2. It comes with a software and calibration utility(Windows 7 have built-in driver for touch screen, this one works but not that accurate since its for Vista supports only). Only 32-bit MS OS
3. The pen comes with sensor to make the cursor more accurate. I let the team animation to use it for their project and they found it great, but instead of laptop, I used LCD 21″ wide. I made a dole to fit the Rx to the LCD frame. Receiver (Rx) must be correctly center and aligned with the screen (don’t block the sensor).
4. I had also used a piece of paper and clip the receiver. This one is good when taking down notes, sketching and etc using ballpoint pen (bundled for ink writing). Ink writing is to record your actual sketches into soft copy (for doctor’s).

The advantage of this is you can clip it in your Laptop screen, LCD monitor or on cardboard. The DuoPen is accurately high resolution even if it does not stated in the specs. This is good for presentation (educational purposes). No need to buy touchscreen LCD or laptop, just add a few bucks then upgrade your laptop/LCD into amazing touchscreen.

bout 83 usd… so yeah.. good price.. im ordering mine tommorow

buying it this week.