3.14. System Space
Following are excerpts from the Unofficial DVD specifications Guide 2.2 ebook.

...The following illustration shows the concept of menu space and system space which imposes restrictions on DVD virtual commands going from one domain to another. The menu space consists of all language units in the Video Manager VMG domain and the Video Title Set Menu VTSM domain. The system space encloses the menu space and the first-play domain. Note that the title domain (Video Title Set VTS domain) is not part of the system space. CallSS links a PGC from the title domain to a PGC in system space to emphasize the restriction that the title domain is not in the system space. JumpSS links PGCs within the system space...

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