left "Amiga" and "v" USUALLY means "OK" and left "Amiga" and "b" USUALLY means "cancel".
Well, this is an Intuition feature. On every requester created with the intuition.library/EasyRequest function, Amiga-V *always* means the leftmost button (usually "Ok") and Amiga-B *always* means the rightmost button (usually "Cancel").
Requesters created by MUI or other third-party stuff might do it another way, but then it is not standard.
Bye,
Thomas