In reviewing the information on these Elotouch monitors, I could not find anything that mentioned that they support 'multitouch'.
The HP TouchSmart brand of touch computers support multitouch but they do not yet have a 'digitally signed' Windows 7 driver. To get multitouch capabilities, you have to run Windows 7 in 'test mode' where it will accept an unsigned driver. Elotouch will have to support multitouch and provide a multitouch driver.
Hope this information helps.