I need to buy this software. Where can I to buy it?
You can't buy the application because it isn't available anymore. Its website has been discontinued and the developers have a forum that deals with something else now. The only way to access the old website is through the Google's CACHE feature.
You can access it below: http://webcache.googleusercontent.com/search?q=cache:3dNI0WlFgysJ:www.gadgetfactory.com/whohasnt.shtml+&cd=1&hl=ro&ct=clnk&gl=us