> For the complete documentation index, see [llms.txt](https://doc.sysdevmobile.com/kalipso/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.sysdevmobile.com/kalipso/5.0/developing/form/controls/events/app-notified.md).

# App Notified

Kalipso - Form - Controls  - Events - App Notified

This event is triggered by a call to the PostAppNotification() action, or by a Notification sent by an external library on Android that is being executed with [RunAPK](/kalipso/5.0/developing/form/actions/actions-description/group-others/run-apk.md)(),[ BarcodeConnect](/kalipso/5.0/developing/form/actions/actions-description/group-barcode/barcode-connect.md)() or [RFIDConnect](/kalipso/5.0/developing/form/actions/actions-description/group-rfid/rfid-connect.md)() actions.

The main use is when you have services running in the background that need to notify your App that something happened, they can use [PostAppNotification](/kalipso/5.0/developing/form/actions/actions-description/group-others/post-app-notification.md)() action to do so.

#### Event available on the following operating systems

![](https://3821468174-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LrTlA1suFa5N48x_83N%2F-MGIW3wIXgRupIGNu8-p%2F-MGIiDGuNcrVFP-DbUma%2FTodos.PNG?alt=media\&token=406123c5-e2bb-4ec6-8044-9533b8686f6f)