during the development of Windows Longhorn (Soon to become Windows Vista) in 2003 Microsoft introduced Windows Sideshow. one of the most unique features Windows Vista had
Windows Sideshow displays information such as RSS feeds e-mail and other things on a separate display
The product seemed cool Microsoft was even planing a hole ecosystem for it. There was even a windows media center remote with sideshow
There are different types of sideshow displays ranging from single line lcd’s to a full color lcd
There were a handful of sideshow compatible devices released. Like the ASUS ScreenDUO
The ASUS W5Fe (AKA the most popular sideshow device)
And the Dell XPS 420
Sadly for windows sideshow it wasn’t popular and support was removed in Windows 8.1. But you can still try Windows Sideshow out
I have archived some sideshow gadgets which you can find here via Retro Network’s FTP directory and if you can’t find a real windows sideshow device you can always download MS-Sideshow Device for android via Google play