A dynamic stabilization device, system, and method for use with a spinal motion segment includes a first bone anchor assembly, a second bone anchor assembly, a first articulation element and a second articulation element. The method is based on the use of a nucleic acid template dependent enzyme in combination with a random primer to generate an enzymatic product which incorporates a binding species and a detectable species covalently linked. The present invention can also be viewed as a method for efficiently transferring files using file differentiation. A common key is generated at the receivers in a certain area.