Before you, all get excited let me tell you that Dual-Phone app is just a toy and Windows and Mac OS have not been ported to the iPhone. However, this is just an app to fool and impress your friends. The app is fun to use and is also had an elegant interface.
When you open the app first, switch to the landscape mode as the app only works in that mode. You will see two logos, namely Windows and Mac. The app gives you a feeling that you are actually logging onto the Windows OR Mac operating system. As you click on any of the two logos, the app will show you a loading screen and then open wallpaper of the Windows OR Mac OS. You can’t do anything after that as no tab nor the mouse seems to work. You can just slide and view the entire wallpaper.
But there is no option to switch from Windows to Apple. You will have to quit the app and reopen it again. On the whole its a good fun app.