The DdfTestOwnerName method syntax has these parts:
DdfTestOwnerName returns a two-byte integer that holds the status of the VAccess control. If this is zero, the dictionaries can be opened and updated with the current dictionary owner name.
DdfTestOwnerName first tries to open the dictionary. If it is successful, it attempts to update the first record to see whether the owner name allows updates or only allows read attempts. The returned status will indicate whether the owner name can open the file, modify the file, or neither.