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# Advanced

This section provides you with information on VuGen capabilities for advanced users.

Topic | Description
--- | ---
Manually program a script | You can program your own functions into a script, instead of recording an actual session. Use the Vuser API or standard programming functions.
Program with the XML API | VuGen enables you to dynamically work with XML code, and retrieve the values during test execution.
Call functions from external DLLs | You can call functions that are defined in external DLLs. By calling external functions from your script, you can reduce the memory footprint of your script and the overall runtime.

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