Digital signage provides dynamic real-time, near-real-time, or non-real-time information that may be individually adapted to the location, time, situation, and who is actually watching the screen. Using simultaneous screen elements such as regions, layers and tickers (or “crawlers”), several messages, originating from different sources (and places), may be combined on one single screen. Though providing information in a fully automated way, the medium also allows for interaction with the viewer, using touch screens or other means of user control.
—Lars-Ingemar Lundstrom, author, Digital Signage Broadcasting:Broadcasting, Content Management, and Distribution Techniques , by NAB-Focal Press
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