VF - Vdata Field Interface VFfieldesize/vffesiz Returns the size, as stored on disk, of a vdata field. VFfieldisize/vffisiz Returns the size, as stored in memory, of a vdata field. VFfieldname/vffname Returns the name of a vdata field. VFfieldorder/vffordr Returns the order of a vdata field. VFfieldtype/vfftype Returns the data type of a vdata field. VFnfields/vfnflds Returns the total number of fields in a vdata.