Wouldn't that be nice if DVD players had an "int 3" (debug trap), but they don't. All you have is the front panel, and experience. A player like my Sony shows you which titleset, title, and chapter is playing, so from there you can locate the PGC.
What would be nice is for someone to write a decompiler for this. IfoEdit comes close, but you have to make notes and hop around a lot. It would be nice to see the whole disk on one (long scrollable) page with invented tags for reference.
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