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The advantages of implementing modules are not limited to external technologies.  Modules may be implemented for functions applicable only to VCL, but may vary based on the environment.  For example, research is being conducted to compare different algorithms which are used to select the image that is loaded on a computer after a reservation is complete.  A module is created for each algorithm, and configuring a managment management node to use a certain algoritym algorithm is as simple as changing one value in the database.

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The following diagram shows how inheritance is organized:
Figure: VCL module inheritance organization
  A few notes about the diagram:

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