Touch is a pre-installed, non-configurable, biological sensory protocol embedded across the full exterior surface of the standard human body unit. It operates without user input, cannot be toggled, paused, or filtered, and was, for several hundred thousand years, considered a feature rather than a defect.
Touch enabled information exchange between biological units via direct physical membrane contact. Unlike contemporary peer-to-peer data transfer, this protocol transmitted no structured packets, carried no verifiable metadata, and offered zero encryption. Despite these considerable technical limitations, embodied users reported it as irreplaceable. This claim has not been formally disproved.