The Formulas & Programming guide, under the heading, “Custom Statements”, says:
“If a database is placed in this folder Panorama will automatically open it when Panorama launches (the database is opened secretly, with no windows). Panorama will then scan the database and register each procedure in the database as a custom statement. (Actually, only procedures with names that are all upper case letters will be registered, for example ZIP or ZAP but not Zip or ZAP23.)”
But … I’ve just created two custom statements called “EULER8” and “EULER11”, both of which work.
Not the most earth-shattering news but interesting.