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Cursor
The cursor serves two main purposes. It acts as a central focus point when multiple viewing panes are open, and it selects a voxel whose information will be displayed in the Tools Window. It also serves as a kind of bookmark for sharing cursors with TkSurfer, as a centroid for rotation, selecting a voxel to be graphed in the Time Course Window, and other various functions, explained later.
Linked Cursor
When the viewing area is split into multiple panes, each panel may have a separate cursor location. If cursor linking is active, setting the cursor in one panel will set the cursor in all panes. Cursor linking can be activated with the 
button on the Main Toolbar.
For example, in the Multiple Views configuration, setting the cursor in the coronal pane will change the slice in the horizontal and sagittal planes. So the cursor becomes a way of navigating through the volume using the three orientations.
Depending on the viewing configuration, with Linked Cursors active, other attributes are linked as well, including zooming and display flags. In Mosaic View mode, only the in-plane cursor coordinates will be linked, so the slice in each pane will be the same. However, if the slice number is increased in one pane, the slice number will be increased in all other panes.
Cursor and Mouse Information
The bottom of the Tools Window displays information about the voxel under the cursor (on the left) and the mouse (on the right). The information displayed depends on the kind of data loaded. If only an anatomical volume is loaded, only the volume index coordinates, volume Talairach coordinates, and volume value will be displayed. (If for some reason a Talairach transform could not be found, RAS coordinates will be displayed instead.)
As other data are loaded, more information will appear in this area. For example, if a functional overlay is loaded, the functional overlay value will appear in this area. Alternatively, the data shown can be changed in the View->Information menu.