2009

LookAt constraint on page 3312 constrains an objects orientation so that
its always looking at another object
Orientation constraint on page 3319 causes the rotation of the constrained
object to follow the rotation of another object
TIP You can use Schematic View to see all the Constraint relationships in a scene.
Using Constraints with Bones
Constraints can be applied to bones as long as an IK controller is not
controlling the bones. If the bones have an assigned IK controller, you can
only constrain the root of the hierarchy or chain.
Attachment Constraint
Animation menu > Constraints > Attachment Constraint
3288 | Chapter 15 Animation