How to Use Any Screen as a Second Display Universal Control is coming in macOS Monterey, but you can use any device as a second monitor right now with the right software or accessories. Having two displays hooked up to your computer instead of one can seriously boost your productivity and open up all kinds of new options for gaming, web browsing, and creative tasks—but you don’t necessarily need to go out and buy yourself a new monitor. From Apple’s Sidecar to Google’s Chromecasting, you’ve got a choice of wired and wireless options when it comes to getting all kinds of screens attached as a second display.