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This method halts playback of the current program and starts playback from the previous program within the program chain (PGC).
Syntax
MediaPlayer.DVD.PrevPGSearch()
Return Value
This method does not return a value.
Remarks
A program is usually equivalent to a chapter, and a PGC is usually equivalent to a title. In the case of One_Sequential_PGC_Titles, each program is required to be a chapter and each title has only one PGC, but in other cases (especially with random/shuffle PGCs and parental blocks) there can be more than one program between chapters and there can be more than one PGC in a title.
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