relativeVelocity how to? (noob question)

Well, with rigidbodies we have the Relative resource as in:

addForce addRelativeForce

addTorque addRelativeTorque

and

velocity.

how can we use RelativeVelocity???

transform.InverseTransformDirection(rigidbody.velocity)

http://unity3d.com/support/documentation/ScriptReference/Rigidbody.AddRelativeForce.html

Might help?