"ViewerFrame Mode=Refresh" a specific web interface parameter used by network security cameras (primarily devices) to stream live video to a browser

However, for developers needing to achieve similar functionality legitimately:

In the world of online gaming, the "ViewerFrame" (often associated with ViewportFrames or specific GUI rendering modes) was a loophole that allowed external software to "see" and "interact" with the game world in ways the developers never intended [1, 2]. For years, scripters utilized these frames to create External ESP (Extra Sensory Perception)

Myth: Only video playback software needs this patch.
Fact: Any software with live-updating graphical panels—from stock tickers to radar systems—benefits from a proper mode refresh.