Global Cross Tracking display the cross hair and Data View Window on ALL charts on the Page for the same time series. The cross hair will stay in place at the point where you click the chart. The Data View window can be moved anywhere on the chart.
For example, you have a Daily chart for Corn, and a Daily chart for Wheat displayed. Using Global Cross Hair Tracking, the cross hair and Data View Window will display data for the same bar on all charts.
To add the Global Cross Hair
From the Chart Tools toolbar, click on the Global Cross Hair tool. 
Click anywhere on the chart to display the cross hair and Data View window.
To deactivate the Global Cross Hair
From the Chart Tools toolbar, click on the Select Arrow 
or hit the ESC key.