A computer system includes a memory controller coupled to a memory module containing several DRAMs. The pulsed laser beam is focused in a vacuum spatial filter. Computing devices that have been secured for the taking of an examination allow a student or prospective professional to access an examination wherever there is an Internet connection. Granular encapsulated compositions can be prepared by using the solid silicone-releasing composition as a component in a laundry detergent powder, tablet or bar. A rotating disk provides a tool for marking the either last dose taken or the next dose due to be taken of a prescribed medication in order to facilitate proper consumption of the medication.