# activeSubsystem

> The active display subsystem, if any. If no display subsystem is active, this property value is null.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine.XR](/engine/6000.7/script-reference/unityengine/xr.md)
* **Assembly:** UnityEngine.XRModule

```csharp
public static XRDisplaySubsystem activeSubsystem { get; }
```

### Remarks

A helper property that references the first display subsystem instance in the list returned by [SubsystemManager.GetSubsystems](/engine/6000.7/script-reference/unityengine/subsystemmanager/getsubsystems.md) or `null` if the list is empty.

Your code should use this property instead of [\_activeSubsystemOrStub](/engine/6000.7/script-reference/unityengine/xr/xrdisplaysubsystem/activesubsystemorstub.md).