User actions question

[ff03k64]

This is the properties info for a user action. What is the "other_notification_success" line for?

USA_Brazil_5_PUs.BUTTON=Brazil
USA_Brazil_5_PUs.DESCRIPTION=Supply 5 PUs to the war effort in Brazil.
USA_Brazil_5_PUs.NOTIFICATION_SUCCESS=5 PUs sent to Brazil.
USA_Brazil_5_PUs.OTHER_NOTIFICATION_SUCCESS=USA shiped Lend-Lease aid to Brazil.

edit: extra question

And what is this trigger for? It is from @Frostion's Iron War map.

        <attachment name="triggerAttachment_Balkan_receive_financial_support-2" attachTo="Germany" javaClass="games.strategy.triplea.attachments.TriggerAttachment" type="player">
            <option name="notification" value="aid"/>
        </attachment>