This command links to a specified cell within the same PGC and optionally highlights a specified menu button. A button value of 0 indicates no highlight. Cells within a PGC are numbered from 1. The DVD specifications support a maximum of 255 cells per PGC and up to 36 highlight buttons per display menu.

This command is often used to repeat the playback of a movie from the beginning after it ends (LinkCN 1) or to bypass a group of cells. The cells are present on the DVD but cannot be accessed by the DVD player. Cells having cell commands are non-seamless by default. LinkCN is not allowed in the First-Play PGC. This restriction is due to the requirement that the First-Play PGC cannot hold video, audio, or subpicture contents.

This command does not execute the pre-command section of its PGC, and therefore it is more efficient than LinkPGCN and LinkPGN. In the title domain, LinkCN is more efficient than LinkPGN since there is no implication to refer to the chapter (PTT) table.

Link to a cell in the same PGC
LinkCN      Highlight button
DVD Command	Hex Encoding
LinkCN 1,button 0	20 07 00 00 00 00 00 01

This command can be combined with the Compare GPRM operations for conditional branching. When combining, this command is executed only if the result of the comparison is true.

1) Compare to another GPRM register and LinkCN
2) Compare to another SPRM register and LinkCN
3) Compare to a constant value and LinkCN