I had one of those ad-display things installed on my computer in that era. I used the manual controls on my CRT to push the ads off the top of the screen, so I

I had one of those ad-display things installed on my computer in that era. I used the manual controls on my CRT to push the ads off the top of the screen, so I could just see like a 2-pixel-wide edge that showed me the thing was still running.