Or in less technical terms, it allows the DLNA capable TV at your parents place to access for instance the images of your last vacation stored on an UPnP MediaServer in your home.
Mirabeau addresses the issue that UPnP is only meant to be used in a local network. With Mirabeau we are able to easily interconnect two or more networks and the UPnP devices therein. All that with a simple, well-used setup - Jabber, and without the need for complicated VPN-tunnels or similar techniques.
What I would like to highlight here is the point that arbitrary UPnP devices do participate in this.
Mirabeau is a transparent bridge for UPnP devices on the application level, not only an ‘I can share my media collection between two instances of the same software’ setup.
Which is of course nice too, but we lifted that to a more higher level and instantly integrate everything that can talk UPnP - PS3, Xbox 360, Totem…
An unmodified UPnP application on the N810 - Nokia’s MediaStreamer is browsing Phil’s server in Spain.
And the same by a Playstation 3: