# OnStartup

The **OnStartup** event can be implemented by a [script add-in](../../../scripting/script_add-ins) to receive notification when Opus starts up.

| **Method Name:**   | OnStartup                                                                                                                                                                                                                                             |
| ------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Argument Type:** | [**StartupData**](../scripting_objects/startupdata)                                                                                                                                                                                                   |
| **Return Type:**   | _none_                                                                                                                                                                                                                                                |
| **Description:**   | This event is only triggered when Opus starts up, therefore only script add-ins that are already installed will receive it. If a script is installed when Opus is already running it won't receive **OnStartup** until the next time Opus is started. |
