TRACKING allows you to display the current location of the
cursor's coordinates in a viewport. These coordinates are
displayed in the Cursor Tracking Window. This option has 
an assigned Immediate Mode command.

There are three options available from the TRACKING
function.

Indicate how you want cursor tracking displayed by 
choosing one of the following options. 

OFF   - to turn off the constant cursor tracking so that 
        the Cursor Tracking Window displays the current 
        position of the cursor only when the cursor button
        is pressed.

VIEW  - to display the position of the cursor in view
        coordinates on the current plane (XP, YP).

WORLD - to display the position of the cursor in world
        coordinates on the current construction plane 
        (x, y, z).
