I have yet to see "as it happened" coverage. I didn't know what happened until the end of the day. I was at the library first and then out walking for exercise. Being in the part of the library where the Internet computers were (to read comic strips as I usually did at that library), I sort of knew what was going on, but not really, and with the new developments every few minutes, I didn't want to know more.
I've seen some documentaries and a TV-movie, but I still don't really know what it was like to see Dan and Tom and Peter.
I'm kind of glad I didn't follow all that, because it sounded worse than it was--except I had no idea about how bad things really were at the World Trade Center until 5 that afternoon. And, yes, without ever hearing anyone say it, I realized it was 9-11 ... and you call 911 in an emergency ... and it doesn't get much worse than this. I also returned to that library and read newspapers, and some columns by Art Buchwald which were related to this sort of thing didn't seem funny that day.