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# XTaskQueueRegistrationToken

> XTaskQueueRegistrationToken

# XTaskQueueRegistrationToken

A token returned when registering a callback, to identify the registration.

## Syntax

```cpp theme={null}
typedef struct XTaskQueueRegistrationToken {  
    uint64_t token;  
} XTaskQueueRegistrationToken  
```

### Members

*token*\
Type: uint64\_t

The token returned when registering a callback to identify the registration.

## Remarks

`XTaskQueueRegistrationToken` represents a *registration token*, returned when registering a callback for a task queue. Use the registration token when un-registering a previously-registered callback. Registration tokens are unique only within the scope of the callback for which you are registering.

`XTaskQueueRegistrationToken` is used by the following functions:

| Header                                                               | Function                                                                                                                                                                 |
| -------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| [XAppCapture](/reference/system/xappcapture/xappcapture_members)     | [XAppBroadcastRegisterIsAppBroadcastingChanged](/reference/system/xappcapture/functions/xappbroadcastregisterisappbroadcastingchanged)                                   |
| [XAppCapture](/reference/system/xappcapture/xappcapture_members)     | [XAppBroadcastUnregisterIsAppBroadcastingChanged](/reference/system/xappcapture/functions/xappbroadcastunregisterisappbroadcastingchanged)                               |
| [XAppCapture](/reference/system/xappcapture/xappcapture_members)     | [XAppCaptureRegisterMetadataPurged](/reference/system/xappcapture/functions/xappcaptureregistermetadatapurged)                                                           |
| [XAppCapture](/reference/system/xappcapture/xappcapture_members)     | [XAppCaptureUnRegisterMetadataPurged](/reference/system/xappcapture/functions/xappcaptureunregistermetadatapurged)                                                       |
| [XGameInvite](/reference/system/xgameinvite/xgameinvite_members)     | [XGameInviteRegisterForEvent](/reference/system/xgameinvite/functions/xgameinviteregisterforevent)                                                                       |
| [XGameInvite](/reference/system/xgameinvite/xgameinvite_members)     | [XGameInviteUnregisterForEvent](/reference/system/xgameinvite/functions/xgameinviteunregisterforevent)                                                                   |
| [XNetworking](/reference/networking/xnetworking/xnetworking_members) | [XNetworkingRegisterConnectivityHintChanged](/reference/networking/xnetworking/functions/xnetworkingregisterconnectivityhintchanged)                                     |
| [XNetworking](/reference/networking/xnetworking/xnetworking_members) | [XNetworkingRegisterPreferredLocalUdpMultiplayerPortChanged](/reference/networking/xnetworking/functions/xnetworkingregisterpreferredlocaludpmultiplayerportchanged)     |
| [XNetworking](/reference/networking/xnetworking/xnetworking_members) | [XNetworkingUnregisterConnectivityHintChanged](/reference/networking/xnetworking/functions/xnetworkingunregisterconnectivityhintchanged)                                 |
| [XNetworking](/reference/networking/xnetworking/xnetworking_members) | [XNetworkingUnregisterPreferredLocalUdpMultiplayerPortChanged](/reference/networking/xnetworking/functions/xnetworkingunregisterpreferredlocaludpmultiplayerportchanged) |
| [XPackage](/reference/system/xpackage/xpackage_members)              | [XPackageRegisterInstallationProgressChanged](/reference/system/xpackage/functions/xpackageregisterinstallationprogresschanged)                                          |
| [XPackage](/reference/system/xpackage/xpackage_members)              | [XPackageRegisterPackageInstalled](/reference/system/xpackage/functions/xpackageregisterpackageinstalled)                                                                |
| [XPackage](/reference/system/xpackage/xpackage_members)              | [XPackageUnregisterInstallationProgressChanged](/reference/system/xpackage/functions/xpackageunregisterinstallationprogresschanged)                                      |
| [XPackage](/reference/system/xpackage/xpackage_members)              | [XPackageUnregisterPackageInstalled](/reference/system/xpackage/functions/xpackageunregisterpackageinstalled)                                                            |
| [XStore](/reference/system/xstore/xstore_members)                    | [XStoreRegisterGameLicenseChanged](/reference/system/xstore/functions/xstoreregistergamelicensechanged)                                                                  |
| [XStore](/reference/system/xstore/xstore_members)                    | [XStoreRegisterPackageLicenseLost](/reference/system/xstore/functions/xstoreregisterpackagelicenselost)                                                                  |
| [XStore](/reference/system/xstore/xstore_members)                    | [XStoreUnregisterGameLicenseChanged](/reference/system/xstore/functions/xstoreunregistergamelicensechanged)                                                              |
| [XStore](/reference/system/xstore/xstore_members)                    | [XStoreUnregisterPackageLicenseLost](/reference/system/xstore/functions/xstoreunregisterpackagelicenselost)                                                              |
| [XTaskQueue](/reference/system/xtaskqueue/xtaskqueue_members)        | [XTaskQueueRegisterMonitor](/reference/system/xtaskqueue/functions/xtaskqueueregistermonitor)                                                                            |
| [XTaskQueue](/reference/system/xtaskqueue/xtaskqueue_members)        | [XTaskQueueRegisterWaiter](/reference/system/xtaskqueue/functions/xtaskqueueregisterwaiter)                                                                              |
| [XTaskQueue](/reference/system/xtaskqueue/xtaskqueue_members)        | [XTaskQueueUnregisterMonitor](/reference/system/xtaskqueue/functions/xtaskqueueunregistermonitor)                                                                        |
| [XTaskQueue](/reference/system/xtaskqueue/xtaskqueue_members)        | [XTaskQueueUnregisterWaiter](/reference/system/xtaskqueue/functions/xtaskqueueunregisterwaiter)                                                                          |
| [XUser](/reference/system/xuser/xuser_members)                       | [XUserRegisterForChangeEvent](/reference/system/xuser/functions/xuserregisterforchangeevent)                                                                             |
| [XUser](/reference/system/xuser/xuser_members)                       | [XUserRegisterForDefaultAudioEndpointUtf16Changed](/reference/system/xuser/functions/xuserregisterfordefaultaudioendpointutf16changed)                                   |
| [XUser](/reference/system/xuser/xuser_members)                       | [XUserRegisterForDeviceAssociationChanged](/reference/system/xuser/functions/xuserregisterfordeviceassociationchanged)                                                   |
| [XUser](/reference/system/xuser/xuser_members)                       | [XUserUnregisterForChangeEvent](/reference/system/xuser/functions/xuserunregisterforchangeevent)                                                                         |
| [XUser](/reference/system/xuser/xuser_members)                       | [XUserUnregisterForDefaultAudioEndpointUtf16Changed](/reference/system/xuser/functions/xuserunregisterfordefaultaudioendpointutf16changed)                               |
| [XUser](/reference/system/xuser/xuser_members)                       | [XUserUnregisterForDeviceAssociationChanged](/reference/system/xuser/functions/xuserregisterfordeviceassociationchanged)                                                 |

## Requirements

**Header:** XTaskQueue.h

**Supported platforms:** Windows, XBOX One family consoles and XBOX Series consoles

## See also

[XTaskQueue members](/reference/system/xtaskqueue/xtaskqueue_members)\
[Asynchronous Programming Model](/build/core-features/common/async/async-programming-model)\
[Async Task Queue design](/build/core-features/common/async/async-task-queue-design)


## Related topics

- [XTaskQueue](/reference/system/xtaskqueue/xtaskqueue_members.md)
- [XTaskQueueUnregisterWaiter](/reference/system/xtaskqueue/functions/xtaskqueueunregisterwaiter.md)
- [XTaskQueueUnregisterMonitor](/reference/system/xtaskqueue/functions/xtaskqueueunregistermonitor.md)
- [XTaskQueueRegisterMonitor](/reference/system/xtaskqueue/functions/xtaskqueueregistermonitor.md)
- [XTaskQueueRegisterWaiter](/reference/system/xtaskqueue/functions/xtaskqueueregisterwaiter.md)