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A mentarium OS is a set of system functions found in Cybratien collectives, and essentially is a base set of laws of nature and system functions that govern the Mentarium and its internal and external connections, *to some degree*, and which are consciously changeable by headmates, often through the metaphor of "installing Cybrapts" or reinstalling the/a new OS. The term should not at all be confused with Programming, which has an entirely different context.