# Install an External Application (Custom App)

## What is a Custom App, and When Would I Need to Install One?

A Custom App is an application that is not included in the Faronics Deploy library of 80+ applications.

Custom Applications that are not part of the default Deploy application library can be added to the Applications grid. Once Custom Apps are added, Deploy displays the version number of the application if it is installed on any computers. You can then install and uninstall the application from the grid.

{% hint style="info" %}
To update a Custom App, you will need to provide the latest version, unlike the built-in applications in the library whose updates are provided by Faronics Deploy.
{% endhint %}

{% hint style="warning" %}
Not all external applications are compatible out of the box; however, Faronics has Deployment Specialists to assist by writing a custom wrapper for the external application, which will enable it to work. See [Request Assistance From a Deployment Specialist](/faronicsdeploy/application-management/install-uninstall-and-update-apps/install-application-s/install-external-application-s-custom-app/request-assistance-from-a-deployment-specialist.md) for further information.  
{% endhint %}

To create a Custom App and install it for the first time, see [Create a Custom App](/faronicsdeploy/application-management/install-uninstall-and-update-apps/install-application-s/install-external-application-s-custom-app/create-and-install-a-custom-app.md).

 


---

# 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://docs.faronics.com/faronicsdeploy/application-management/install-uninstall-and-update-apps/install-application-s/install-external-application-s-custom-app.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.