Fat Server applications are easier to manage and deploy on the network because most of the code runs on the servers.
Fat servers try to minimize network interchanges by creating more abstract levels of service.
Transaction and object servers, for example, encapsulate the database.
The client in the fat server model provides the GUI and interacts with the server through remote procedure calls (or method invocations)
These are used for mission-critical applications, represent the new growth area fro PC-based client/server computing.