Yes, as metadata is stored in the file system where the respective files are, it is visible to any Kyno instance browsing that directory. That means you can share metadata by passing on removable drives or editing metadata data on a network drive. However, there is currently no conflict management, locking or real-time updates in all conceivable cases. We are looking at extending those collaboration capabilities in a team or collaboration version or extension of Kyno.
Related:
Where content is stored by Kyno