# Dual Screen Display

### Introduction

When the AR app is put into the background, the view inside the glasses still shows the AR application, while the phone screen switches to the desktop and can open any 2D app. In other words, the main screen (phone screen) and secondary screen (glasses screen) display different application views.

<figure><img src="/files/cCqMo5R5l64yxNyFkJR8" alt=""><figcaption></figcaption></figure>

### Usage

Developers can decide whether to turn on this function through the option **`supportMultiResume`** in **`NRProjectConfig`**, which is turned on by default. After turning on this function, the user needs to turn on a permission to use the application for the first time.

<figure><img src="/files/0IkGXpN0KVbSAwcOotTs" alt=""><figcaption></figcaption></figure>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://xreal.gitbook.io/nrsdk/development/tools/dual-screen-display.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.