# GH_Synchronisation enum

Namespace: [Grasshopper.Kernel.Special](https://developer.rhino3d.com/api/gh1/namespace/grasshopper.kernel.special.md) · Assembly: [Grasshopper](https://developer.rhino3d.com/api/gh1/assembly/grasshopper.md)

```cs
public enum GH_Synchronisation
```

Enumerates the possible synchronisation states between a cluster instance and the cluster file.

## Values

| Name | Value | Description |
| --- | --- | --- |
| Unset | 0 | Indicates an unset (unsolved) state. This state is never returned. |
| NotReferenced | 1 | Indicates this cluster is not supposed to be synchronized with a file. |
| MissingReference | 2 | Indicates the reference file doesn't exist. |
| UpToDate | 3 | Indicates this cluster is in sync with the reference file. |
| OutOfDate | 4 | Indicates this cluster is not in sync with the reference file. |