<para>The <seecref="M:GLib.Application.Opened"/> event utilizes this delegate:</para>
<para>Event data is passed via the <seecref="T:GLib.OpenedArgs"/> parameter.</para>
<para>To attach a <seecref="T:GLib.OpenedHandler"/> to an event, add the OpenedHandler instance to the event. The methods referenced by the OpenedHandler instance are invoked whenever the event is raised, until the OpenedHandler is removed from the event.</para>