A managed memory in which multiple computing entities each have a corresponding entity-specific portion that is subject to garbage collection. The formation of alloy results in a change in resistance of the cell structure so that one or more programmed states are determined. Additionally the system can be used as a means of limiting network access, filtering programming, providing on-screen graphics or audible signals for particular programming types or providers, bookmarking programming, profiling network users, targeting advertising, and simplifying network transactions. The actuator further comprises a plunger connected to the anchor plate and at least one spring configured to guide the plunger. It further relates to pharmaceutical compositions comprising these compounds, and chemical processes for preparing these compounds.