An authoring system for interactive video has two or more authoring stations for providing authored metadata to be related to a main video data stream and a multiplexer for relating authored metadata from the authoring sources to the main video data stream. In one embodiment, a bypass directory tracking process includes setting bits in a bypass directory when a corresponding architectural register is written. The tungsten silicide nitride film has a small thickness of 2 to 5 nm and has a lower interface resistance for achieving a low-resistance gate electrode, suited for a higher-speed operation of the semiconductor device.