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# Development Role: Development Login

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Using TopLink Workbench, you create a development login in the TopLink Workbench project file when your project is based on a relational database platform.

TopLink Workbench uses the information in the development login whenever you perform a data source operation from within TopLink Workbench, for example, whenever you read or write schema information from or to a data store during application development. The development login information is never written to a `sessions.xml` or `project.xml` file.

The development login is never used when you deploy your application: it is overridden by either the `sessions.xml` file (see "Non-CMP Session Role: Session Login") or the `project.xml` file (see "CMP Deployment Role: Deployment Login").

For more information on creating a development login, see "Configuring Development and Deployment Logins".