How can non-existent objects be identified in the applet?
https://www.geogebra.org/material/show/id/gsb3efkh reddit 240503-b Michel IROIR — May 3, 2024 - 4:54 PM
https://www.reddit.com/r/geogebra/comments/1cj78tl/how_can_nonexistent_objects_be_identified_in_the/