Currently, we know only that Netscape browsers can show it. The server is currently instructed not to send the chart on the selection page if you are not running on Netscape. The following chart is about as complicated as you'll ever see it. The description of what's going on is below the actual chart. In brief, each subject is a different color.
Lectures are solid, while recitations have a dark border around each option.
We'll start with green. That's the solid color. The class has a single recitation on Friday at 11. Next, look at yellow. 6.033 has a lecture MWF at 2.