<!--
{
  "documentType" : "article",
  "framework" : "vmnet",
  "identifier" : "/documentation/vmnet/event_xpc_dictionary",
  "metadataVersion" : "0.1.0",
  "role" : "collectionGroup",
  "title" : "event XPC Dictionary"
}
-->

# event XPC Dictionary

XPC dictionary keys used by the `event` value returned to the client in the `handler` callback specified by the `vmnet` function that provides information about the callback event.

## Topics

### Constants

[`vmnet_estimated_packets_available_key`](/documentation/vmnet/vmnet_estimated_packets_available_key)


---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)