(1) Short for channel access method, a protocol for how data is transmitted in the bottom two layers of the OSI model. CAMs describe how networking systems put data on the network media, how low-level errors are dealt with, and how the network polices itself. Polling, contention and token passing are three examples of CAMs.
All these systems are concerned with automatically directing the manufacture and inventory of parts.
(3) Slang term to describe a bootleg copy of a movie that was recorded in the movie theater with a digital video camera. It's usually poor quality and the sound in a CAM is recorded by the cameras microphone, meaning it will capture theater sounds and laughter and such from the attending movie-goers.