# IGuidAware interface

Namespace: [Grasshopper2.Doc](https://developer.rhino3d.com/api/gh2/namespace/grasshopper2.doc.md) · Assembly: [Grasshopper2](https://developer.rhino3d.com/api/gh2/assembly/grasshopper2.md)

```cs
public interface IGuidAware
```

Implement this interface in your [IDocumentObject](https://developer.rhino3d.com/api/gh2/type/grasshopper2.doc.idocumentobject.md) if you wish to be notified about object instance id changes.

**Derived types:** [Component](https://developer.rhino3d.com/api/gh2/type/grasshopper2.components.component.md), [GroupObject](https://developer.rhino3d.com/api/gh2/type/grasshopper2.specialobjects.groupobject.md), [IPin](https://developer.rhino3d.com/api/gh2/type/grasshopper2.parameters.ipin.md), [Pin<T>](https://developer.rhino3d.com/api/gh2/type/grasshopper2.parameters.pin-1.md), [TimerObject](https://developer.rhino3d.com/api/gh2/type/grasshopper2.parameters.special.timerobject.md)

## Methods

- [ApplyIdMap](https://developer.rhino3d.com/api/gh2/type/grasshopper2.doc.iguidaware/applyidmap.md)