An RSS feed (RSS: Rich Site Summary Feed) collects short information that can be read with a suitable program, the so-called feed reader. Outlook, for example, which is also available to you free of charge in the RRZ's Office 365 for Students package, is capable of processing RSS feeds. You can find instructions on how to do this here.
In each room of the AGORA platform (group, project and community rooms) an RSS feed can be activated. By subscribing to this, you will receive real-time notifications when a person has joined the room, materials have been uploaded, etc.