This command links to a specified PGC within the same domain. The domain can be the Video Manager VMG domain, the Video Title Set VTS domain, or the Video Title Set Menu VTSM domain. This command is not allowed in the First-Play domain since there can be only one PGC in the First-Play domain.

PGCs within a domain are numbered from 1 and counted up sequentially to a limit of 999. In the VTS domain, the PGCs are numbered from 1 for each video title set VTS. In the VMG and VTSM domain, the PGCs are numbered from 1 for each language unit present in the domain.
This command is often used to:

control and alter the flow of playback going from the title menu to other PGCs in the Video Manager VMG domain,
branch from the root menu or other predefined menus (angle, audio, sub-picture, or chapter) to other PGCs within the same language unit in the VTSM domain.
in the VTS domain, this command is often used to branch from one PGC to another PGC within the same title (a title having mutiple PGCs).

Link to a PGC in the same domain
LinkPGCN
DVD Command	Hex Encoding
LinkPGCN 1	20 04 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 LinkPGCN
2) Compare to another SPRM register and LinkPGCN
3) Compare to a constant value and LinkPGCN