Detail-in-context techniques are described. The retarders can include active retarders such as tunable liquid crystal birefringent elements, passive retarders such as fixed retarders, andor combinations thereof. During the charge transfer process, a pre-determined voltage is applied to the measurable capacitance, and the measurable capacitance is then allowed to share charge with a filter capacitance through a passive impedance that remains coupled to both the measurable capacitance and to the filter capacitance throughout the charge transfer process. Security functions for protecting the signaling network andor a central apparatus are set up or utilized on central apparatuses. The method includes the steps of: providing the virtual workstation; allowing a person to access the virtual workstation to generate multimedia product; and requiring that the person complete at least one educational project to continue accessing the virtual workstation to generate multimedia product. Such filtration is applied to that noise which travels through an Internet line as well as through a basic power line.