---
title: Undefined Usage
framework: hiddriverkit
role: collectionGroup
role_heading: API Collection
path: hiddriverkit/undefined-usage-enum
---

# Undefined Usage

A constant that indicates a device’s usage doesn’t correspond to one of the defined behavior types.

## Topics

### Getting the Undefined Usage Page

- [kHIDUsage_Undefined](hiddriverkit/khidusage_undefined.md)

## See Also

### Essentials

- [Usage Pages](hiddriverkit/usage-pages-enum.md)