Some features of version control are only available in JBuilder Professional and Enterprise versions.
JBuilder provides features that make team development faster, smoother, and easier. It also provides revision support in every edition. To see version information for a file, click on the History tab at the bottom of the content pane. The tabs provide different views of revision information, depending on your JBuilder edition.
For more information, see:
Introducing JBuilder: Comparing files and versions
Team Development Using JBuilder: Welcome to team development in JBuilder