Android can run multiple applications simultaneously, but you can actually install the Windows operating system on an android tablet just like you install it on your PC. All you need is a Windows emulator android mobile or tablet you want to install windows on, in any version of the Windows operating system. Installing the external OS on your Android device will void your warranty as the tools used to install Windows OS on android devices are not certified by Google itself. You will need a USB Cable, a High-speed internet connection, an Android tablet, Laptop/PC running on windows, and a File transfer tool.