The message displays the Javascript message box. It is part of the RemoteSkin Web API.
{ "id": "a1b4984f-7582-45ce-a292-d7e86732f4f8", "name": "WEB_ALERT", "description": "Show a message.", "slots": [ { "key": "1", "name": "MESSAGE", "direction": "REQUEST", "mandatory": "true", "type": "STRING", "description": "The message to show." } ] }