In Maya using with inverse kinematics involves using tools called “IK handles” that pose joint chains. The effect of the IK handle on the joint chain depends on the type of IK solver the IK handle is using.
Maya provides three types of IK handles: Single Chain handle, Rotate Plane handle, and Spline handle. Each type of IK handle uses a different type of IK solver.
A little more explanation about IK handles and Pole Vectors
(http://accad.osu.edu/~midori/03_750/handouts/IK_solvers.html)
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