3 PTS aligns an instance by letting you select two 
alignment points, the instance you want to align, and the
location with which you want to align the indicated 
instance.

Select the alignment points using options from the
Position Menu. CADKEY uses these points to form an axis
along which your alignment tracking path forms.

Cursor select the instance you want to align with the
point; CADKEY surrounds the active instance with a dashed,
highlighted box.

Select the point to align the instance with using an
option from the Position Menu.

CADKEY positions the instance you want to align within a
tracking path.

Select a new alignment position for the instance along the
tracking path using an option from the Position Menu.
