> ## Documentation Index
> Fetch the complete documentation index at: https://docs.pads4.com/llms.txt
> Use this file to discover all available pages before exploring further.

# System Viewer Variables

Viewer Variables, also known as **Dynamic Filtering**, enable **data-driven content management** in PADS4. This feature allows you to create a **single presentation** that dynamically adjusts for multiple Viewers based on predefined values.

For a detailed example of how to use Viewer Variables, refer to the **Viewer Variables Introduction Page**.

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## **System Viewer Variables**

In addition to **custom Viewer Variables**, PADS4 provides **System Viewer Variables** at runtime. These built-in variables allow you to access essential system information dynamically.

### **Available System Viewer Variables**

| **Viewer Variable Name** | **Description**                                                                      |
| ------------------------ | ------------------------------------------------------------------------------------ |
| **viewername**           | The **identification name** of the Viewer.                                           |
| **monitorname**          | Same as **viewername**. Used in older PADS versions for **backward compatibility**.  |
| **pads4serverurl**       | Displays the **URL of the PADS4 Server**, formatted as:**HTTP(s)://server/hostpath** |

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## **How System Viewer Variables Work**

* **Automatic Updates** – System Viewer Variables are generated by PADS4 at runtime and always reflect the current Viewer state.
* **Use in Presentations** – You can include them in **text fields**, **data providers**, or **other dynamic content elements**.
* **Compatibility** – These variables ensure **seamless integration** between different PADS4 versions.

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## **Conclusion**

System Viewer Variables provide essential information about the **Viewer and PADS4 Server** without requiring manual input. They simplify **content customization and automation**, making PADS4 a more efficient **digital signage solution**.