# ISystemTarget

Package: [Microsoft.Orleans.Core.Abstractions](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/) 10.0.0

[NuGet package](https://www.nuget.org/packages/Microsoft.Orleans.Core.Abstractions)

```csharp
public interface ISystemTarget : IAddressable
```

This is a markup interface for system targets. System target are internal runtime objects that share some behavior with grains, but also impose certain restrictions. In particular: System target are asynchronously addressable actors. Proxy class is being generated for ISystemTarget, just like for IGrain System target are scheduled by the runtime scheduler and follow turn based concurrency.