A client-server architecture provides mechanisms to assist in minimizing round trips between a client and server. The architecture exposes an object model for client use that is structured similarly to the server based object model. The client batches commands and then determines when to execute the batched commands on the server. Proxy objects act as proxies for objects and serve as a way to suggest additional data retrieval operations for objects which have not been retrieved. Conditional logic and exceptions may be handled on the server without requiring additional roundtrips between the client and server.