They often happen when someone has the file open, selects the Type Tool, clicks somewhere within the document, but never types anything. Or if someone used the Direct Selection Tool to delete an item, but did not delete all of the points.
Stray points can occur in a multitude of ways. They occur much more frequently in Illustrator than other drawing programs because of its basic selection interface.
However, some programs' exports intentionally place stray points at opposite corners of the page bounds in order to convey those bounds to the importing program. (I often see this in imported DXFs.) That sounds like the kind of situation you are describing.
Thanks "may I call
l you" James
I believe you are correct. That is a perfectly logical explanation. I very seldom have seen it though and I use that process often.
Along another note, I appreciate your contributions, advise, and tutorials posted on the forum. They have helped me immeasurably. Thanks for that to.