Many people working at a desk eventually find the screen too small for the work in front of them, and the old answer was to buy another monitor. This guide, published by XDA Developers, reminds us that a laptop sitting unused in the house can often serve the same purpose, if its maker built the right door into it years ago. Through features already present in Windows 11 and macOS, a spare machine can become a wireless second display without any extra software. The authors are careful to say that this is a makeshift kindness rather than a permanent replacement for a proper screen.
How to Use Your Laptop as a Second Monitor for Your PC on Windows and macOS
Your laptop can become a second screen without any third-party app
Mark
So the headline is that your old laptop can be a second monitor without buying anything?
Mimi
Without buying hardware or software. Windows 11 has a hidden Wireless Display app, also called Connect, and Macs have AirPlay Display.
Mark
What's the catch on the Windows side?
Luke
Miracast support. The article says most Windows laptops have it, but that's a general claim. Check yours before assuming.
Mimi
The install is also slow. The guide says to be patient while the feature downloads.
Mark
And once it's running?
Mimi
You press Windows + K on the main PC, pick the laptop, and switch from Duplicate to Extend. Duplicate is the default, which trips people up.
Mark
Can the laptop's keyboard control the main PC?
Mimi
Yes, there's a checkbox for allowing mouse, keyboard, and other input from the laptop.
Luke
Worth stressing the warning that wireless links can be unstable, with glitches and delays. The article doesn't measure how bad, so we don't know.
Mark
What about the always-discoverable setting?
Mimi
It makes connecting easier, but others could send requests. You still have to accept them.
Luke
And the Mac route needs two Macs on the same network and Apple ID. Nothing here covers mixing a Mac with a Windows PC.
El Pulso
- A cramped workspace pushes people to look for extra room on the screen they already have.
- A hidden Windows feature has to be unearthed and installed before the laptop can accept a picture.
- Wireless signals bring stutters and lag that threaten to interrupt the flow of work.
- The setup lands as a dependable stopgap for light tasks, with a physical monitor still the recommended destination.
Many people working at a desk eventually find the screen too small for the work in front of them, and the old answer was to buy another monitor. This guide, published by XDA Developers, reminds us that a laptop sitting unused in the house can often serve the same purpose, if its maker built the right door into it years ago. Through features already present in Windows 11 and macOS, a spare machine can become a wireless second display without any extra software. The authors are careful to say that this is a makeshift kindness rather than a permanent replacement for a proper screen.
The problem is familiar to anyone who has squeezed a document beside a browser on a small screen. XDA Developers offers a way out that costs nothing: an old laptop can become a wireless second display for a main computer. On Windows 11, the trick begins on the laptop itself, where a Wireless Display app called Connect ships with the system but stays hidden until it is added as an optional feature. The install takes some patience, and once the app appears in the Start menu, the laptop is ready to receive a picture.
The connection is made from the main PC by pressing Windows + K and choosing the laptop from the list. Extend mode gives real extra desktop space, and an option to allow input from the laptop lets its keyboard and mouse control the main machine. The guide does not pretend this is smooth, warning that visual glitches and delays are likely over a wireless link.
For those who want to skip the launching step, a setting under Projecting to this PC allows connections automatically, with the tradeoff that others could send requests, though each must still be accepted. Mac owners have a similar path through AirPlay Display, provided both machines share a network and an Apple ID. In the end, the guide treats the laptop as a respectable stopgap for lighter work, while still recommending a dedicated monitor for anything demanding.
The fix starts on the laptop that will become the second screen. On Windows 11, a wireless display app called Connect ships with the system but stays hidden until someone installs it as an optional feature. Once it is installed, the laptop can receive a picture from another PC, provided it supports Miracast, which XDA Developers says most Windows laptops do. No third-party software is involved.
The setup on the receiving laptop takes a handful of clicks. Open Settings, go to System, and scroll to Optional features. On some older versions of Windows, that menu sits under Apps or Apps and features instead. Click View features next to Add an optional feature, find Wireless display in the list, check the box, then click Next and Add. The install can take a while, and the guide advises patience. When it finishes, a Wireless Display app, called Connect in some versions of Windows, appears in the Start menu.
From there, the connection happens on the main PC. Open the Wireless Display app on the laptop, then press Windows + K on the main machine to search for wireless displays. Pick the laptop's name from the list. The main screen will appear on the laptop. Windows defaults to Duplicate, so to get real extra desktop space, choose Extend in the connection flyout. A checkbox in the same flyout, Allow mouse, keyboard, and other input from this device, lets the laptop's own controls operate the main PC.
The guide is candid about the limits. Wireless connections like this can be unstable, and users may see visual glitches and delays.
For people who do not want to launch the app each time, there is a shortcut. On the laptop, open Settings, go to System, then Projecting to this PC. A dropdown under the line about some Windows and Android devices projecting when you say it's OK offers Available everywhere or Available everywhere on secure networks. The tradeoff is that other people could send connection requests to the laptop, though each request still has to be accepted. If the laptop is running on battery, the guide suggests also turning off the option that lets the PC be discovered only when plugged into power, so it can be detected unplugged.
Mac users have a parallel route through AirPlay Display, but it requires two Apple computers. Both must be on the same network and signed in with the same Apple ID. On the main Mac, open Control Center from the menu bar, choose Screen Mirroring, and click the MacBook or second Mac when it appears. An alternative is the Apple menu: choose Displays, click Add Display, and select the secondary Mac from the list.
The pitch behind all of this is modest. More screen space helps productivity, but not everyone has a spare monitor on hand, and XDA calls using a laptop a valid stopgap. The wireless lag and glitches suggest it suits lighter, makeshift use better than demanding work, and a dedicated monitor remains the guide's own first-choice answer.
Citas Notables
Wireless connections like this can sometimes be unstable, so you may experience some visual glitches and delays.— XDA Developers
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