How to extend your Mac's desktop with an iPad and Duet Display Our third and final method is especially good if you already carry an iOS device with your Mac.

You can dual monitor with VirtualBox virtual machine or guest OS. To be able to use VirtualBox on Multiple Monitors with any virtual machine, you need to change the default settings.

Extended desktop: Use your iPad as a second display for additional screen space. Refer to one app while you work in another, or see how a presentation looks in presentation mode on your iPad while ...