In today's digital environment, there's often a need to expand your workspace, but you don't have an extra HDMI cable or external monitor handy. Luckily, the operating system Windows 10 and 11 Offers built-in wireless second-screen connectivity. This allows you to transform any available laptop or tablet into a full-fledged display in minutes, using only your local network.
This approach is especially relevant for remote work, when you need to lay out diagrams, code, or correspondence in front of you without cluttering your desk with wires. Technology MiracastThe underlying technology of this process ensures image transmission with minimal latency, making it suitable even for watching videos or working with documents. However, for stable operation, it is critical that both devices are on the same network and support the wireless display standard.
Before proceeding with setup, it's worth making sure your hardware is ready for use. Not all older laptop models support wireless projector hardware, so checking compatibility is the first step. Below, we'll detail how to set up signal reception and transmission so you can effectively use the resources of two computers simultaneously.
Checking network compatibility and requirements
The first and most important step is verifying the technical capabilities of your devices. To connect a laptop monitor to another laptop via Wi-Fi, both computers must support the technology. Wi-Fi DirectThis is a standard that allows devices to communicate directly, bypassing a router, although in most scenarios they will still be on the same local network for authentication.
You can check for support for this feature using the command line. Launch Terminal with administrator privileges and enter a special command that will display the status of the wireless display drivers. If the report shows support, your laptop can act as a receiving device.
netsh wlan show driverIn the received report, find the line Wireless Display SupportedIf it's there Yes, then the hardware is ready to use. Also, make sure Wi-Fi is enabled on both devices, even if you're connected to the internet via an Ethernet cable—a wireless interface is often used to transmit the video stream.
⚠️ Attention: If you have third-party antivirus software with the "Network Protection" feature installed, it may block the connection. We recommend temporarily disabling the firewall or adding an exception for Windows system services during setup.
What should I do if the driver does not support Wi-Fi Direct?
If the report says "No," this means the network card doesn't support the feature at the driver level. Try updating the Wi-Fi adapter drivers from the manufacturer's website. If this doesn't help, using the built-in Windows feature is impossible, and you'll have to resort to third-party software that transfers data over TCP/IP.
Setting up the receiving laptop (Second screen)
To turn a second laptop into a monitor, you need to enable projection on it. This feature is built into Windows by default, but it may be disabled by default for security reasons. Go to the system settings menu and find the section responsible for projection to this computer.
The path to the settings may differ slightly depending on the OS version, but the general logic remains the same. Open Parameters (keys Win + I), then select System and find the item Projecting to this computerIf you don't see this section, the component may not be installed on your system.
- 📱 Click "Additional components" at the bottom of the window.
- 🔍 In the search bar, enter "Wireless Display".
- ⬇️ Check the box and click "Install" to add the missing module.
After installing the component, return to the projection menu. Here you need to configure visibility settings. In the "Always Disabled" drop-down list, select Available everywhere on secure networks or "Available Everywhere" if you're on a trusted home network. It's also recommended to enable a PIN code for the first connection to prevent unauthorized access to your screen.
Now launch the "Connectivity" app. You can find it by searching in the Start menu. A blue background will appear on the screen indicating a connection is pending. At this point, the laptop is ready to receive a signal.
☑️ Preparing the receiving device
Connecting the host laptop (Image transfer)
Now let's move on to the main computer from which you'll be broadcasting. Make sure it's connected to the same Wi-Fi network as the receiving device. Differences in internet speed aren't important here; local connectivity between the machines is key.
To start searching for available displays, use hotkeys Win + KThis will open the "Connection" sidebar on the right side of the screen. The system will begin scanning the airwaves for devices ready to receive a Miracast signal.
Your second laptop's name should appear in the list of available devices. Click it. The receiving device may prompt you to confirm the connection and enter a PIN if you configured this option previously. After confirmation, the screen will dim briefly, and then the image from the primary laptop will appear on the second one.
After successful pairing, you can control the screens' operation mode. Press Win + Pto choose how exactly the second screen will be used: duplicate, extend, or just the second screen. Mode Expand is the most popular because it turns a second laptop into an extension of your desktop, allowing you to drag and drop windows between displays.
Eliminate lag and optimize performance
Wireless video transmission always introduces a certain amount of delay, known as latencyThis isn't noticeable during office work, but during dynamic actions, the cursor may "float." To minimize this effect, it's important to consider the wireless signal frequency.
The ideal condition is to work in the range 5 GHzThis frequency range is less crowded and provides higher throughput than the classic 2.4 GHz band. If your router is dual-band, make sure both laptops are connected to the 5 GHz network.
| Parameter | 2.4 GHz | 5 GHz | Recommendation |
|---|---|---|---|
| Signal range | High | Average | For working in one room, 5 GHz is better |
| Channel loading | High (neighbors, Bluetooth) | Low | 5 GHz is more stable for video |
| Bandwidth | Up to 150-300 Mbps | Up to 800+ Mbps | Critical for Full HD stream |
| Penetration ability | Good | Bad | Make sure the laptops are close |
It's also worth checking your power settings. Windows may be trying to save energy by reducing the power of your Wi-Fi adapter. Go to device Manager, find your network adapter, open its properties and on the "Power Management" tab, uncheck "Allow the computer to turn off this device to save power."
Alternative solutions using third-party software
If built-in Windows tools don't work or are too resource-intensive, you can use specialized software. These programs often use their own compression codecs, allowing for better performance even on slow networks.
One of the popular solutions is the program SpacedeskIt operates on a client-server principle: the driver is installed on the host PC, and the client application is installed on the laptop, which will act as a monitor. The main advantage of this approach is the ability to connect not only via Wi-Fi but also via a LAN cable, guaranteeing zero latency.
- 🖥️ Spacedesk: The best choice for creating an additional screen with high frame rates.
- 🎮 Parsec: Geared towards gamers, but great for work thanks to minimal image compression.
- 🔧 TeamViewer / AnyDesk: Allows you to control a second screen, but has a more noticeable cursor lag.
Using third-party software requires installing apps on both devices. This can be inconvenient if you're working on someone else's computer or on a corporate network with software installation restrictions. However, in challenging situations where standard Miracast constantly loses connection, this is the only viable solution.
Common problems and their solutions
Despite the simplicity of the technology, users often encounter typical errors. The most common one is "Unable to connect." This can occur due to security protocols being out of sync or ports being blocked by a firewall.
If the devices can see each other but the connection drops during the handshake, try updating the graphics card drivers on both laptops. Often, the problem lies not with the Wi-Fi module, but with the codec. H.264, which is used to compress the video stream and is processed by the graphics processor.
⚠️ Attention: Settings interfaces and item names may change with Windows updates. If you can't find the menus described, use the system settings search or refer to the official Microsoft documentation.
It's also worth considering that the screen resolution on the second laptop may automatically adjust to its display, resulting in a blurry image. In this case, go to Settings → System → Display and manually select the recommended resolution for the second monitor.
Questions and Answers (FAQ)
Is it possible to connect a laptop to a laptop via Wi-Fi without a router?
Yes, this is possible using Wi-Fi Direct technology. One laptop will create a direct connection, which the other will then connect to. However, internet access may be required for initial setup and driver installation.
Why is the image on the second screen lagging?
Delays are most often caused by congestion on the 2.4 GHz channel or a weak signal. Try switching to a 5 GHz network, moving the devices closer together, or lowering the image resolution in the projection settings.
Does this method work between Windows and macOS?
The native "Projection" feature in Windows does not support receiving a signal directly from macOS. To communicate across operating systems, you will need to install third-party software that supports the AirPlay protocol or a native client.
Does connecting a second screen affect internet speed?
Yes, since the video stream uses a Wi-Fi connection. If you have a slow or congested internet connection, page loading speed may decrease. On a local network without internet access, speed will not be affected.