The fl.ik package contains methods and classes that interact with inverse kinematics (IK) armatures created in Flash CS4. These classes set constraints, track events, and animate existing armatures. These classes do not create or add armatures, "bones" or "joints". First create the armature in Flash CS4; the parts of the armature collectively form the IKArmature object. Then, use the classes of the fl.ik package to retrieve information about the IKArmature object (with the IKArmature, IKBone and IKManager classes), track events and set event handlers for stages of IKArmature movement (with the IKEvent class), and control the motion of the IKArmature (with the IKJoint and IKMover classes).