iDatabase is designed for a personal use. You can not use a single database between multiple users or maintain a single database synchronized between multiple users.
One possible mode of use a database in a shared environment is the one in which a person updates its own database and then share it with other users via email. Other users can then import the updated version of the database.
Related solutions:
- The location of iDatabase files
- Which Export/Import and Backup feature supports iDatabase?
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Can I keep a database file in the Dropbox folder?