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Within a package you have modules that represent distinct parts of your package/product. If you require engine side functionality you will have a module that runs in the WinGate engine. If you need to present a user interface then you will may also need decide to have a separate UI module. Each module shows up in the Modules panel of the WinGate Management Console and can be enabled or disabled by the administrator if the appropriate setting is in the manifest file for that module.
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