Login, well, logs me into the program. Fill imputs the itemid (which is needed occasionally for boring technical reasons), Print reprints the last label, Delete deletes the last scan (like if I hit 8 and it turns out it's a 12), Auto is for an experimental feature where it assumes I'm as fast at handling fiche as the scanner is at scanning it, Enhance is for lightening up dark slides so I can be sure they're all scanned properly, and done finishes the batch and prints a label