---
page_type: sample
description: "Demonstrates how to create a Windows USB function controller driver using the USB function class extension driver (UFX)."
languages:
- cpp
products:
- windows
- windows-wdk
---

# USB Function Client Driver

This is a skeleton sample driver that shows how to create a Windows USB function controller driver using the USB function class extension driver (UFX).

This sample demonstrates the following:

- Registration with the UFX class extension driver

- Handling USB transfers

- Handling function controller events

- Handling attach and detach notifications

- Handling charger/port detection

- Power management

## Operating system requirements

Windows 10 Mobile

## Customizing the sample for your device

This sample is not a functional driver. It is a skeleton driver intended to illustrate the general design of a UFX client driver.  The sample contains a number of comments prefaced with " #### TODO ", which indicates where code will need to be added to perform the controller operation as described in the comment.

## Installation Note

Installation on Windows 10 Mobile requires the creation of a package.  To properly interact with the USB UI on Windows 10 Mobile, the package must include a Security Element that specifies the ID_CAP_USB capability with DEVICE_READ and DEVICE_WRITE rights.