AUTO aligns two instances by letting you choose a fixed
instance and the instance you want to align. The instance
you want to align uses the fixed instance as a reference.
CADKEY aligns the two by figuring out the common axis
between them.

To use AUTO, the scale of the drawing instances you want
to align must be identical. You cannot align two instances
with different drawing scales; if you try to, CADKEY
displays an error message. 

To change the scale of individual instances use
DETAIL, LAYOUT, INSTANCE, MODIFY, SCALE.

CADKEY prompts you to select the fixed instance. Cursor
select the fixed instance.

Cursor select the instance you want to align to the
fixed instance. 

CADKEY figures out the instances' common axis and 
positions the drawing instance you chose to align in a 
tracking path with the fixed instance. 

If CADKEY cannot align the axes of the two instances, it 
automatically rotates the second instance so that it will
align correctly. 

Cursor select a new alignment position along the tracking
path.
