By restricting certain high-resource tasks to one "exclusive" viewer, the hardware can maintain a stable frame rate without being overwhelmed by multiple simultaneous control requests.
Because many early IP cameras were installed with default settings and no password protection, searching for inurl:"ViewerFrame? Mode=Exclusive" allows anyone to find live, controllable camera feeds from around the world. This has made the term a case study in the importance of: viewerframe mode exclusive
Ensuring that local camera feeds are not indexed by search engines. viewerframe mode exclusive