~~Title: OnShutdown ~~
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The **OnShutdown** event can be implemented by a [[:scripting:script_add-ins|script add-in]] to receive notification when Opus is shutting down.


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$$ (#)**Method Name:**
$$ OnShutdown
$$ (#)**Argument Type:**
$$ **[[..:scripting_objects:shutdowndata|ShutdownData]]** 
$$ (#)**Return Type:**
$$ //bool//
$$ (#)**Description:**
$$ Opus calls this event when it is shutting down. The **ShutdownData.endsession** property will be **True** if Opus is quitting because Windows is shutting down. If **endsession** is **False**, you can return **True** from this event to prevent Opus from quitting - the return value is ignored if Windows is shutting down too.
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