Missing Kid Saver Technology.
GSA receives the missing children cases from NCMEC. They determine which cases should be displayed and for how long.
So how can we keep your screensaver current with the latest information?
If the status of a missing child case changes, NCMEC makes this change in their database and when GSA's server calls the XML, and follows its references, it automatically gets the latest data. The XML is relative and only contains references to cases (like where to get it). The XML does not contain absolute data (like descriptive case information).
The screensaver also only contains references such as "get picture from this location and text data from that location." All references point to GSA's server.
The screensaver is set to:
GSA is able to push live information to each screen 'right now,' as in a live notification system, but presently we are working with 3 hour intervals.
Wikipedia: Digital signage is a form of out-of-home advertising in which content and messages displayed on an electronic screen, or digital sign, can be changed without modification to the physical sign, typically with the goal of delivering targeted messages to specific locations at specific times. Digital signage offers superior return on investment compared to traditional printed signs.