developers.home-assistant/docs/app_integration_index.md

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Native App Integration	Introduction

This guide describes how to build a native Home Assistant app that communicates with Home Assistant and offers a seamless integration. Below is a list of the things that we will discuss in this guide.

• Allow the user to establish a connection and authenticate with their own Home Assistant instance.
• Send location and device info back to Home Assistant.
• Call services, fire events and render templates.
• A view to control the house via an authenticated webview.