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# Event Handlers

Some of the actions that you can send to Media Server are asynchronous. Asynchronous actions do not run immediately, but are added to a queue. This means that the person or application that sends the action does not receive an immediate response. However, you can configure Media Server to call an event handler when an asynchronous action starts, finishes, or encounters an error.

You might use an event handler to:

- Return data about an event back to the application that sent the action.
- Write event data to a text file, to log any errors that occur.

Media Server can call an event handler for the following events.

OnStart | The `OnStart` event is called when Media Server starts processing an asynchronous action from the queue.
OnFinish | The `OnFinish` event is called when Media Server successfully finishes processing an asynchronous action.
OnError | The `OnError` event is called when an asynchronous action fails and cannot continue.

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