A method and apparatus for tracking the use of a distributable software application uses two identification codes and a tracking assistant to monitor the operation and distribution of the software application. The phase change memory device includes a substrate with a first electrode layer formed thereon. The at least one form-fitting element in turn has a hole that functions as a tie-down grommet when the saddlebag is removed. Such an implant is capable of supporting the compressive and cyclic loads required of a natural disc. The immobilized peptide may bind one or more targets selected from the list consisting of: bacteria, Gram-negative bacteria, Gram-positive bacteria, pathogens, protozoa, fungi, viruses, and cancerous cells.