An android to our desktop?
Yes we can do that , there are lots of software online to use to emulate android on desktop .We can download android Apps and games and played it on Windows OS.That's how both the OS works at the same time., but first let's know how to display the Android screen on our desktop.
Surely we can do it using USB cable to connect and a software to install that is needed, there are lots of software we can use that provide the functionality of displaying the mobile screen on the desktop.
One of the popular software is Droid@Screen, its very easy to use. Just search it in Google and download it.You must Android SDK to install , also you can download it online, this will use the Android ADB to archive that functionality.