# GetUnmanagedSystems(Allocator)

> Get the list of unmanaged systems in this group, sorted by update order.

## Definition

* **Type:** Method
* **Namespace:** [Unity.Entities](/engine/7000.0/script-reference/unity/entities.md)
* **Assembly:** UnityEngine.EntitiesModule

```csharp
public NativeList<SystemHandle> GetUnmanagedSystems(Allocator allocator = Allocator.Temp)
```

### Parameters

**** (\[Allocator]\(/engine/7000.0/script-reference/unity/collections/allocator)): Which allocator to use to allocate the returned list.

### Returns

| Type                                                                                          | Description             |
| --------------------------------------------------------------------------------------------- | ----------------------- |
| [NativeList\<SystemHandle>](/engine/7000.0/script-reference/unity/collections/nativelist1.md) | A NativeList of systems |