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Despite the common acronym, a PPN can be given through entirely different means depending on the context—whether medical, financial, or legal. For example, a medical PPN is administered intravenously, while a financial PPN is delivered as a structured investment product by a financial institution.

PPN is a complex acronym with vastly different meanings across multiple fields, including medicine, law, and technology. The lifespan or duration of a PPN therefore depends entirely on its specific context, from a medical patient's short-term intravenous feeding to a user-controlled, on-demand computer network.