captbly, the figures prof was throwing around are visible on what are called Level II charts. On Level II charts you can see what MM are lined up and at what price on the ask and at the bid, as well as the last sale price, and the updated volume ALL basically in REAL TIME.
The figures seen at the top of our iHub board, and if you click on the Level II there,it will bring up three columns. The last column does show trade data but this information, and the chart that shows on the board, and most of the charts you see, are about 20 minutes behind. Therefore if you are a member of a brokerage that has Level II available for clients it gives you maybe a 15-20 minute heads up on current data. My Ameritrade also has immediate last sale prices as a separate window and you can really see what the PPS is when selling and not 20 minutes later, and not rounded off to only two or three digits.
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