Simple system. In rulevar(988) you specify the stringlist ID. Or 0 if you do not want this tab to be active.
Each row represents a help chapter that can have title, text and video link using a clickable eventpicture. The following columns need to be present in the specified stringlist.
column 0 = The shortname for the help page
column 1 = Full title
column 2 = Full text (you can use the mouse over ?-mark system in the formatting)
column 3 = Event picture slot #
column 4 = Video link. Using the games .exe location as the base path. So for example 'videos/tutorial1.mp4'