Why do I still get login prompts even though DENY and ALLOWWEBCHANGE are set to allow WikiGuest?

There is some mention of the {AuthScripts} influence over site access in AccessControl, but it doesn't make it obvious that you need to remove the save script from the {AuthScripts} list in configure.

Otherwise, Foswiki will still present a login prompt for save and comment requests even if you have set DENY/ALLOWWEBCHANGE to allow WikIGuest (unauthenticated users).