Remote Desktop

Watch your agents work in real time, or take over the mouse and keyboard yourself — all through a built-in VNC viewer in the Yao Agents UI.

## Open a remote desktop session

1. Go to the **Tai Link** panel in Yao Agents.
2. Click the device you want to view.
3. Click **Remote Desktop** (or the VNC icon on the device card).

The VNC viewer opens inside Yao Agents — no external VNC client needed.

![Tai Link — VNC remote desktop](https://cdn.yaoagents.cn/assets/en/tai/03-tai-vnc-en-$__THEME.png)

## What you see

The viewer shows the full desktop of the remote device (or the container desktop if the agent is working inside a Docker sandbox). You can:

- **Watch** an agent build a website, analyze data, or run tests in real time.
- **Take over** — click into the viewer and use your mouse and keyboard. The agent pauses interaction while you have control.
- **Resize** — the viewer scales to fit your browser window.

## How it works behind the scenes

Tai Link includes a **VNC Router** that bridges WebSocket connections (from your browser) to raw TCP VNC servers running on the remote device or inside containers.

The URL pattern is `/vnc/{containerID}/ws`. When an agent starts a container with a desktop (port 5900), the VNC Router automatically discovers and connects to it.

For **host-level VNC** (the physical screen), enable it at startup:

```bash
tai server --host-vnc-port 5900 http://<YOUR_YAO_SERVER>:5099
```

Or in `config.yml`:

```yaml
upstream:
host_vnc_port: 5900
```

## Troubleshooting

**VNC viewer shows a blank screen.**
The VNC server inside the container or on the host may not have started yet. Wait a few seconds — agents typically need a moment to boot the desktop environment.

**"Failed to connect to VNC server."**
Tai Link couldn't reach port 5900 on the target. If using Docker, make sure the container exposes port 5900. If connecting to the host, verify a VNC server (like x11vnc or TigerVNC) is running.

**Laggy or slow display.**
VNC performance depends on network bandwidth between your browser and the Yao server, and between Yao and the Tai Link device. On slow connections, expect some delay.

## What's next

- [File sync](/docs/en-us/tai-link/file-sync) — transfer files to remote workspaces
- [Security & privacy](/docs/en-us/tai-link/security-and-privacy) — connection encryption and access control