Of course I know the cat is there somewhere. Don't most cats lay on your, lap, on top of the monitor or on top of your mouse pad when you sit at your computer? Since they are content just to sleep, they are just taken for granted until of course something goes wrong with the computer and you star panicking
When the missus sits at the computer the cat lays on her lap as she strokes it. I don't allow that because if I move the cat starts to fall off and hooks onto me privates with its claws