The client stub unmarshals the result message.

Finally, the client stub returns the result to the client application, completing the "remote call."

This entire process makes the remote call transparent to the client application, abstracting away the complexities of network communication.

Two-Tier Architecture:
- A two-tier architecture is a client-server model where the presentation layer (client) runs on a client machine, and the data layer (server) runs on a separate server machine. The application logic can reside on either the client or the server, or be split between them, but there are only two distinct tiers involved in the communication.
- It's often referred to as "client-server" architecture where the client directly communicates with the database server.
Diagram:
Types of Two-Tier Architecture:
- Thin Client: Most of the application logic resides on the server. The client primarily handles presentation. (Less common in direct 2-tier, more in 3-tier).
- Fat Client (or Thick Client): Most of the application logic resides on the client machine. The server is primarily a database server. This is the more common interpretation of a direct two-tier system.
Advantages:
- Simplicity: It's relatively straightforward to design, develop, and deploy compared to multi-tier architectures, especially for smaller applications.
- Faster Development: Fewer layers mean less complexity, potentially leading to quicker development cycles.
- Direct Communication: The client directly communicates with the database, which can reduce network latency and improve response times for simple queries.
- High Performance for Small Systems: For a limited number of users, direct database access can be very efficient.
- Lower Initial