When I was a kid and asked my dad what he did as his job, his answer was always the same: “I mark papers.”
This gave no explanation of what he did as a job, and while I can spit out his title like I can any episode of Friends, I still have no idea what he actually does.
But the point of all of this is that I get what he means by “marking papers”. In a world of computers and the Internet (even though in the 90s I would guess that he had sort form of a dinosaur computer) I do actually, mark papers.
I mark my weekly calendar that I print out on Monday.
I mark notes in my notebook.
I scribble down messages on post-its.
I mark papers.