A client apparatus for utilizing services by executing service programs includes a policy holding unit, a verification unit, a verification result holding unit, and a verification result notification unit. The peripheral device includes at least a peripheral processor set for providing specific operations, and pulse circuitry electrically connected to the peripheral processor for producing pulse signals with a predetermined first frequency and transmitting to the peripheral processor. The subject selection methods are used to identify oligonucleotide and nonnucleotide molecules with desirable properties for use in pharmaceuticals, drug discovery, drug delivery, diagnostics, medical devices, cosmetics, agriculture, environmental remediation, smart materials, packaging, microelectronics and nanofabrication. The legs of the device may be locked such that the device may be left unattended in a standing position.