Application Designer is the main application development tool of the PeopleTools suite, and it also offers a rich set of lifecycle management features that you will use frequently when upgrading, applying updates provided by Oracle, or applying customizations to your production database. These features enable you to:
Copy projects between databases.
Compare definitions in one database to like definitions in another to assess the upgrade or update impact.
Merge definitions from one database to another.
Create change packages to apply updates to your system automatically using Change Assistant.