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# Application Name

The application name argument of the realm connect call selects the application definition, which contains administrative information that the application needs at run time, such as the binding of endpoints to transports, and message formats.

## Null Application Name

To support coding experiments and rapid protoyping, the realm connect call accepts a null application name. A null argument selects the `default` application definition.

The `default` application definition supports any program that satisfies these conditions:

- Every call that creates a publisher or a subscriber specifies a null endpoint name.
- The program uses dynamic formats or built-in formats, but not managed formats.

To start an FTL server that contains the default application definition (and no other application definitions), omit the data directory parameter (data) from the FTL server configuration file. See "FTL Server Configuration" in TIBCO FTL Administration.

Note: Do not use null application names when developing programs for production environments, nor in any situation that requires control over run time details.

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TIBCO FTL® - Enterprise Edition

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