The document area will contain document like items such as charts and source files. Documents cannot be docked within other panes, however, documents can be split within the document area or "float". Click the tab area of the document with the left mouse button and begin to drag the tab.
Notice that the chart for CAT is outside of the main RightEdge application window. This chart can be dragged anywhere on the screen or even to another monitor. It will continue to update (if in live data mode) just as if it were within the main application window.
To snap the chart or document back to the document area, simply grab the title bar portion of the floating window and drag it back to the document area.
See Also
Using the RightEdge Environment