I forget what thread and company it was but a couple of weeks...

I forget what thread and company it was but a couple of weeks ago someone posted that the tag CXXT in the 'course of sales' was that of the Chi-X exchange. I have just had it confirmed this is incorrect and is in effect Commsec and is the average of the top buy/sell quotes at any time. It is limited to brokers which allows them to slightly manoeuvre the market. At the bottom of the Commsec trading screen is a clear statement that Chi-x is not included in its quotes.