London's BT Tower Broadcasted Windows 7 Error Message Over the Weekend (theregister.co.uk)
An anonymous reader quotes a report from The Register: Generally a system crash is a private affair, but the BT Tower, one of London's tallest landmarks, spent much of the weekend displaying a Windows error message in a very public fashion. The building, originally known as the Post Office Tower, is famed for both its revolving top floor and, more recently, for the banks of LEDs at its summit that act as a very prominent billboard. Sadly for BT over the weekend it was showing what looks very like a Windows 7 error screen. "Choose operating system to start or press TAB to select a tool: (Use arrow keys to highlight your choice and then press ENTER)."
Most of these fancy LED billboards are really just VGA displays (well, part of one anyway). They just leave some crap running on a bog standard PC, and have the billboard driver software pointed at a certain part of the desktop, simaler to video screen capture software.