Although specific instructions for labeling slides appear in the AP Coordinator's Manual that is sent to schools shortly before the AP Examination period, much of the slide labeling can be done throughout the year, as various works are photographed. When placing the slides in the plastic sheets, be sure to insert the slides so that the top of the image is toward the top of the plastic sheet. No, it does not. It's true that the AP number is useful in the unlikely event that a slide falls out of the slide sheet and needs to be re-united with the rest of the slides.
Students are, of course, free to put it on each slide if they prefer.
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