HAL is often remembered as a machine that rebelled, but this episode argues he did exactly what he was told by people who gave him two incompatible orders. It follows the making of the character, from a 1964 lunch to the advisers, IBM's conditions and Douglas Rain's quick recording, and clears away myths such as the IBM letter-shift.
Whether HAL is conscious is left open by the film. So is whether Clarke's novel should count as authoritative for what the film says, and whether Kubrick's withholding of explanation was artistry or a result of late cuts.