"Sideshow allows little bits of data from a Windows Vista PC to be accessed from a lightweight display, even while the computer is hibernating. Many so-called "gadgets" have been written for Sideshow.
The good news is that a few folks from Microsoft have written an application that allows a Sideshow device to communicate with Media Center Extenders in the home.
Previously, Sideshow could only communicate with Vista PCs. As Evans says, "First, Sideshow was only console-aware. Now it has the ability to talk to different extenders." writes Julie Jacobson of cepro.