FieldIDsfileName - the name of an open database file (local or remote).FileMaker Pro 6.0 or earlierRelated fields are returned as TableID::RelatedFieldID.If layoutName is empty, then the field IDs of the default table will be returned.FieldIDs(“Customers”;””) returns IDs of all unique fields in the default table of Customers.FieldIDs(“Customers”;”Layout#5”) returns IDs of all unique fields, including related fields, on Layout#5 in Customers.