9. PGC Architecture.
Each title may have up to 999 program chains (PGCs). A PGC may have from 0 to 255 programs, which are ordered collections of pointers to cells. Physical data and the logical presentation data structure converge at the cell level. The PGC connects cells together, defines the order of programs, and which cells are played. Programs within a PGC are used for sequential, random, or shuffle play, and cells can be used by more than one program chain. Programs may contain one or more contiguous cells which can act as a chapter of a video title. These program units are also known as part-of-titles due to the fact that they may be stored in different PGCs.

Groupings include parental management blocks, angle blocks for multiple camera angles, interleaved blocks for seamless branching, etc. A PGC contains pointers to the next, previous, or GoUp PGC to support common remote control buttons Next, Previous, and Return, respectively. A PGC provides a 16-color palette for subpicture colors which may be present in any of the cells in the PGC. A PGC has a command table that can have up to 128 pre-commands, post-commands, or cell commands.

In summary, a PGC provides the following major functions in all domains:

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