The crosshair in different windows automatically track each other in what is generally an appropriate manner. No commands are required to start correlated crosshair tracking. Crosshair correlation is dependent on the label given to each axis of the spectrum during the referencing process. For example, consider the case where 5 windows are open, with axis labels as indicated below.
If a vertical crosshair moves in window "a", the horizontal crosshair of window "b" and the vertical crosshair of window "e" will move. If the horizontal crosshair of window "a moves, the vertical crosshair of window "d" and the horizontal crosshair of window "e" will move. The crosshair in each window only tracks the motion of the moved crosshair if the plot limits of the window overlap the position of the moved crosshair. Crosshair tracking can be disabled in a window by changing the window's axis label(s).