I went through the process as outlined above. I stand corrected in large part, as you can indeed use this to get all of the fares displayed as rcs85551 says. The only problem is that, as he says, you have to then click on the rules for each fare listed to see the actual booking class, fare code, and fare rules. If only they'd just include those in the fare listing so one could scan all the fares quickly.

When I actually tried to book the K fare, however, on a sample ATL-LGA-ATL roundtrip, it took me through the process and then at the last minute, after the flights had been selected, it priced the itinerary at the lowest fare, not at the preferred inventory (K) fare. So, while this looks like something I can use for research, it doesn't look like a place I'll be booking.