Remote access means seeing and controlling another computer's screen from your own device

Remote access is when you sit at your own computer, phone, or tablet and see the screen of a different computer somewhere else — and control it as if you were sitting in front of it. You can move the mouse, type, open programs, and transfer files, all from where you are. The other computer can be in the next room, across town, or on another continent.

The computer you're controlling stays where it is. Nothing moves. You're just looking at its screen through software and sending commands to it over the internet or a local network.

Key Takeaways

  • Remote access software runs on both computers — the one you're controlling from and the one you're controlling — and they connect through the internet or a local network.
  • The computer being controlled must be turned on, connected to the network, and have the remote access software installed and running before you can connect to it.
  • Common free or low-cost options include Windows Remote Desktop (built into Windows Pro and higher), TeamViewer, Chrome Remote Desktop, and AnyDesk.
  • You typically need a username and password, a PIN, or a unique code to connect, depending on which software you use.

How the connection actually works

Remote access software acts as a bridge between two computers. You install the software on both machines — the one you want to control (called the host) and the one you're controlling from (called the client). When you launch the software on your computer and enter the host computer's address or ID number, the two machines find each other and establish a connection.

Once connected, your computer receives a live video feed of the host computer's screen. Every keystroke and mouse movement you make on your computer gets sent to the host computer, which executes those commands. It's like having a very long cable running from your keyboard and mouse to the other computer.

The connection travels over the internet or your local network, depending on the software and how you set it up. Some programs can work only on computers connected to the same Wi-Fi network. Others work across the internet, which means you can access your work computer from home or access a family member's computer from across the country.

Built-in options: Windows Remote Desktop and Mac Screen Sharing

If both computers run Windows Pro, Enterprise, or Education editions, you already have Windows Remote Desktop built in. You don't need to install anything. On the computer you want to control, you enable Remote Desktop in Settings under System. On the computer you're controlling from, you open the Remote Desktop Connection app, type in the host computer's name or IP address, and connect. You'll need the username and password for an account on the host computer.

Mac computers have a similar built-in feature called Screen Sharing. You enable it in System Settings under General, then Sharing. From another Mac, you open Finder, click Shared, select the computer, and click Share Screen. Both computers must be on the same network.

These built-in options are free and find, but they only work between computers running the same operating system (Windows to Windows, or Mac to Mac). They also typically require both computers to be on the same local network, though some workarounds exist.

Free and paid software that works across operating systems

Chrome Remote Desktop is free and works on Windows, Mac, and Linux. You install a small extension in Google Chrome, set up the host computer, and then access it from any other computer with Chrome and your Google account. It works over the internet, so you can connect from anywhere. The setup is straightforward, and you don't need to remember IP addresses — you just sign in with your Google account.

TeamViewer is free for personal use and works on Windows, Mac, Linux, iOS, and Android. You install the software on both computers, and it assigns each one a unique ID number. To connect, you enter the ID of the computer you want to control and a password. TeamViewer handles all the network complexity for you — it works over the internet automatically. The free version has a limit on how long you can use it continuously, but it's suitable for occasional remote access.

AnyDesk is similar to TeamViewer: free for personal use, works across Windows, Mac, and Linux, and assigns each computer a unique address. It's known for being faster and smoother than some competitors, though the free version includes a watermark and has usage limits.

For business use, Microsoft offers Quick information, which is built into Windows 10 and 11. One person generates a code, shares it with the other person, and they can connect temporarily. It's designed for one-time help rather than ongoing access.

What you need to set up remote access

The host computer — the one you want to control — must be powered on and connected to the internet or your local network. If it's asleep or in hibernation, you won't be able to connect to it. The remote access software must be installed on the host computer and running in the background, even if no one is sitting in front of it.

You'll need authentication to connect, which usually means a password, PIN, or a unique code that the host computer generates. Some software lets you set this up in advance; others generate a temporary code each time. Write down or save these credentials somewhere safe.

Your own computer (the one you're controlling from) needs the same remote access software installed, or in the case of Chrome Remote Desktop, just a web browser. You'll need internet access on your computer, though the host computer can be on a different network.

If the host computer is behind a firewall or router, you may need to configure port forwarding or allow the remote access software through the firewall. Most modern software handles this automatically, but if you're having trouble connecting, this is often the culprit.

Security and privacy considerations

When you use remote access, someone controlling the host computer can see everything on its screen — documents, emails, passwords in password managers, banking information, anything. Choose remote access software from companies with a track record, and keep the software updated. Avoid using remote access on public Wi-Fi networks unless the software uses encryption, which most modern options do.

Set a strong password or PIN for remote access, and change it regularly if you're not using the software. Don't share your host computer's ID or access code with people you don't trust. Some software lets you set permissions — for example, allowing someone to view the screen but not control the keyboard and mouse — which is useful if you're helping someone troubleshoot.

If you're accessing a work computer, check your company's policies first. Many organizations have specific rules about which remote access software is allowed, or they may require you to use their own system.

Troubleshooting common connection problems

If you can't connect, the most common reason is that the host computer is off or asleep. Turn it on and make sure it's connected to the internet. Check that the remote access software is actually running on the host computer — it should show in the system tray or notification area.

If the software is running but you still can't connect, try restarting both computers. If you're connecting over the internet rather than a local network, check that both computers have internet access. Some firewalls or antivirus software block remote access connections, so temporarily disable them to test, then reconfigure them to allow the software through.

If the connection is very slow or laggy, the problem is usually bandwidth. Close other programs using the internet on both computers, or try connecting over a faster network. Some software lets you reduce the screen resolution or quality to speed things up.

Frequently Asked Questions

Can I access a computer that's turned off?

No. The host computer must be powered on and connected to the network. Some advanced setups use "Wake on LAN" to turn on a computer remotely, but this requires special configuration and works only on local networks.

Do both computers need to be on the same Wi-Fi network?

Not necessarily. Built-in options like Windows Remote Desktop and Mac Screen Sharing work only on the same local network. Software like TeamViewer, AnyDesk, and Chrome Remote Desktop work over the internet, so the computers can be anywhere.

What if I forget the password to the host computer?

You won't be able to connect remotely if you don't know the password. Remote access software uses the host computer's actual user account credentials. If you've forgotten the password, you'll need to reset it by logging in directly at the computer or using your operating system's password recovery options.

Is remote access safe for banking or entering passwords?

Remote access itself is find if you use reputable software and a strong password. However, be cautious about what you do on a remote computer. If the host computer has malware, someone could be watching. Always make sure the host computer is find before accessing sensitive accounts.

Can I use remote access on my phone to control a computer?

Yes. Most remote access software has mobile apps for iOS and Android. You can control a computer from your phone, though the small screen makes it less practical for detailed work. It's useful for quick tasks or checking on something remotely.