---
title: Interprocess communication
framework: uikit
role: collectionGroup
role_heading: API Collection
path: uikit/interprocess-communication
---

# Interprocess communication

Display activity-based services to people.

## Topics

### User activities

- [NSUserActivity](foundation/nsuseractivity.md)
- [UIUserActivityRestoring](uikit/uiuseractivityrestoring.md)

### Services

- [UIActivity](uikit/uiactivity.md)
- [UIActivityViewController](uikit/uiactivityviewcontroller.md)
- [UIActivityItemSource](uikit/uiactivityitemsource.md)
- [UIActivityItemProvider](uikit/uiactivityitemprovider.md)

## See Also

### App structure

- [App and environment](uikit/app-and-environment.md)
- [Documents, data, and pasteboard](uikit/documents-data-and-pasteboard.md)
- [Resource management](uikit/resource-management.md)
- [App extensions](uikit/app-extensions.md)
- [Mac Catalyst](uikit/mac-catalyst.md)