How could turn two monitors connected in one PC acting like two different devices?

I would like to use my two monitors which are connected to my PC to be acting like two different devices. How could I achieve this?

My requirements:

My second display is touchable pad which would customers use for informations, application use, interactive commercial view etc. Touchable pad extends primary desktop monitor. OS is Windows 7. I would like to achieve that customer and user of PC works simultaneously and that mouse pointer doesn't go in second monitor. I would like to have some free programm or write an app to do this. I can write an app in C# or Java. I just need some guides.

Regards, Igor