---
title: mNotificationArgument4
framework: IOKit
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 18.4+, macOS 10.7+]
path: iokit/iovideodevicenotification/1503923-mnotificationargument4
---

# mNotificationArgument4

A UInt64 whose usage depends on the the specific kind of notification.

## Declaration

```occ
UInt64 mNotificationArgument4;
```