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# Advantages of the TopLink Three-Tier Architecture

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Although the server session and the client session are two different session types, you can treat them as a single unit in most cases, because they are both required to provide three-tier functionality to the application. The server session provides the client session to client applications, and also supplies the majority of the session functionality.

This section discusses some of the advantages and general concepts associated with the TopLink three-tier design, including the following:

- Shared Resources

- Providing Read Access

- Providing Write Access

- Security and User Privileges

- Concurrency

- Connection Allocation