# GetSubsystems<T>(List<T>)

> Returns active Subsystem s of a specific instance type.

## Definition

* **Type:** Method
* **Namespace:** [UnityEngine](/engine/6000.0/script-reference/unityengine.md)
* **Assembly:** UnityEngine.SubsystemsModule

```csharp
public static void GetSubsystems<T>(List<T> subsystems) where T : ISubsystem
```

### Parameters

**** (\[List\<T>]\(https\://learn.microsoft.com/dotnet/api/system.collections.generic.list-1)): Active subsystems.