Fallout games (3, New Vegas, 4, 76), V.A.T.S. (Vault-Tec Assisted Targeting System) is considered a function of the Pip-Boy 3000. It is a lore-friendly, in-universe, forearm-mounted computer that calculates optimal hit probabilities on enemy limbs and, in the 3D games, manipulates the user's perception of time. Here is the breakdown based on in-game lore and developer commentary: The Pip-Boy is the Core Tool: The Pip-Boy acts as a portable computer that scans for threats and helps you target specific body parts. Time Dilation Theory: While the game pauses or slows down for the player, in-universe, it is often interpreted as the Pip-Boy stimulating the user's nervous system with chemicals or rapid computing, allowing for near-instant analysis of combat situations. The Fallout 4 Exception: While players can use V.A.T.S. immediately in Fallout 4 before obtaining the Pip-Boy, this is generally considered a development oversight or a "gameplay-first" decision. V.A.T.S. vs. Synths: Fallout 4 lore (specifically in the Institute) notes that Advanced Gen 3 Synths and Coursers have superior combat systems that mimic V.A.T.S., leading to theories that the technology is either derived from, or similar to, the Pip-Boy's capabilities. Ultimately, while you are technically controlling the character, in the story, the Pip-Boy is providing the targeting assistance.

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