If Admin allows it, visitors can choose their own username and password for instant access to the database, with the ability to modify their entries later. A locking mechanism insures that no 2 users will write to the file at the same time. This makes the database robust for high volume applications. An integrated shopping cart is available for Webdata. You will have all the speed, power, and relational capabilities of mySql, but still use Webdata's easy interface to modify records, fields, and layout options.
All upgrades are backwards compatible.
If the current version meets your needs, future versions will too.