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3.6. Graphical display of VMG domain
Following are excerpts from ebook.

...Since the DVD specifications do not allow branching directly from one VTS to another, the VMG domain often contains many empty PGCs with only precommands to route requests from one VTS to another. The following illustration shows common virtual commands used by PGCs in the VMG domain...

vmg

The above illustration shows possible virtual commands in the VMG domain: JumpSS, JumpTT, and LinkPGCN.

is used to direct playback to the First-Play PGC, or to a predefined menu of a VTS (indicated by the number 1).

is used to play back a video title in a VTS (indicated by the number 2).

is used to link to a PGC in the same VMG domain. The DVD specifications do not permit linking to a PGC in the VTSM domain that are not a predefined menu (root, audio, angle, PTT, or sub-picture) or to any PGC in the VTS domain directly.

3.7. Virtual commands in VMG domain
Following are excerpts from ebook.

...The following virtual commands are available in the Video Manager VMG domain:

VM Command Description
1. No Operation.
2. Go to a specified command line.
3. Exit the current command section.
4. Terminate the playback of a video DVD.
5. Link to a PGC in the same domain.
6. Link to a program in the same PGC.
7. Link to a cell in the same PGC.
8. Resume playback.
9. Jump to a video title.
10. Jump to a PGC in System Space.
11. Define contents of a GPRM register.
12. Set GPRM register/counter mode.
13. Set Highlight Menu Button.
14. Set Audio Mixing Mode for Karaoke.
15. Set Temporary Parental Management.
16. Compute GPRM, compare to another GPRM and Link
17. Compare GPRM, compute another GPRM and Link
18. Compare GPRM, compute another GPRM, Link


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