SlideShowView.AdvanceMode (PowerPoint)
Returns a value that indicates how the slide show in the specified view advances. Possible return values are ppSlideShowManualAdvance - Manual Advance, ppSlideShowRehearseNewTimings - Rehearsed timings, ppSlideShowUseSlideTimings - Specified timings for each slide.
The value returned by the AdvanceMode property can be one of these PpSlideShowAdvanceMode constants.
Dim pssAdvanceMode As PpSlideShowAdvanceMode
pssAdvanceMode = SlideShowWindows(1).View.AdvanceMode