The Push API gives web applications the ability to receive messages pushed to them from a server, whether or not the web app is in the foreground, or even currently loaded, on a user agent. This lets developers deliver asynchronous notifications and updates to users that opt in, resulting in better engagement with timely new content.
Unfortunately, because of technical limitations, WebCatalog Desktop doesn't support the Web Push API at the moment. This might prevent certain apps from sending you notifications in the background. We understand this is not ideal and really hope to support the API in the future.