> For the complete documentation index, see [llms.txt](https://developer.singular.live/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.singular.live/software-development-kits/overlay-sdk/use-case-examples.md).

# Use case examples

### Send notifications from the overlay SDK to a composition script <a href="#send-notifications-from-the-overlay-sdk-to-the-composition-script" id="send-notifications-from-the-overlay-sdk-to-the-composition-script"></a>

This example uses video.js callbacks to listen to specific player events. The Overlay SDK sends a notification to the composition script when an event occurs. The composition script then updates control nodes in the composition to trigger the indicators.

[Contact the Singular support team](/support/support-resources.md#developer-support) for a copy of the composition.

Use the player controls and watch the status indicators changing.

{% embed url="<https://codepen.io/Singular/pen/dyoXjZW?editors=1010>" %}

### Send messages from composition scripts to the overlay SDK <a href="#send-messages-from-composition-script-to-the-overlay-sdk" id="send-messages-from-composition-script-to-the-overlay-sdk"></a>

This example shows how to receive messages from a composition script to the overlay SDK.

[Contact the Singular support team](/support/support-resources.md#developer-support) for a copy of the composition.

Click on the interactive icons build within Singular to play the according clip in the video.js player.

{% embed url="<https://codepen.io/Singular/pen/NWqrBgO?editors=1010>" %}


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