# Package com.smartgwt.client.rpc

- Interface Summary
  Interface | Description
  --- | ---
  ExportImageCallback |
  HandleErrorCallback |
  HandleTransportErrorCallback |
  LoginRequiredCallback |
  MessagingCallback |
  MessagingConnectionDownCallback |
  MessagingConnectionUpCallback |
  QueueSentCallback |
  RPCCallback |
  RPCQueueCallback |

- Class Summary
  Class | Description
  --- | ---
  DMI | This class provides static methods to call server-side DMI methods exposed via a `ApplicationDeclaration` file.
  LoadScreenCallback |
  Messaging | The Messaging class provides APIs to make use of SmartGWT Real-Time Messaging module, an optional module available with SmartGWT Power or Enterprise Edition which allows browser based web applications to publish and subscribe to HTTP Messaging channels, allowing the application to receive (and send) messages delivered via server push for "real-time" updates from the server without polling.
  RPCManager | RPCManager is a static singleton class that manages transparent client/server RPC (remote procedure call).
  RPCRequest | Encapsulates a client/server RPC request.
  RPCResponse | Encapsulates an RPC response from the server.