Traded and Available
The Traded and Available window shows the various amounts of money that have been traded or are available at the various odds for the selection you currently have your mouse over. In addition it also shows the amounts looking to Back and Lay at SP. Once a market is closed for betting the window will just show the traded amounts and the prices at which they were traded.

When rolled up in the Main Info Bar the header displays the current display setting and the number of different prices that there are amounts currently available at or that have been traded. This varies depending on what display setting you have selected as shown below.

By right clicking on the header it brings up the various options for this window.

Horizontal Grid Lines - turns on/off the horizontal grid lines
Vertical Grid Lines - turns on/off the vertical grid lines
Traded and Available - displays all of the amounts that have been traded or are available at the various prices
Traded - displays all of the amounts that have been traded or are available at the various prices
Available - displays the amounts that are available at the various prices
SP - displays the amounts that are wanting to be matched at SP and the minimum odds at which the Back bets want to be matched at and the maximum odds at which the Lay bets want to be matched at
Sort - switches the sort between ascending by Price and descending by Price