Place a click box on the stage to pause the slide. Select the Click Box's Shortcut field and then hit the TAB key to set this as the shortcut, which means it is equivalent to clicking the Click Box with a mouse. Make sure the end of the Click Box object on the timeline is at least a second or so before the end of the slide. (The pause-point for a Click Box is at the end of its timeline object, not in the middle like buttons or Text Entry Boxes.)
When the user gets to the slide it should be paused by the Click Box. Hitting the TAB key should then unpause the movie to continue playback or execute whatever action you have assigned to the Click Box ON SUCCESS event.