Abstract: A method and system for executing an application at a client are described. An application is divided into portions. A first portion of code for the application is transmitted to the client over a network. The first portion of code is executed at the client to cause the client to generate a user interface that is displayed by the client, detect user interaction with the user interface, and transmit from the client over the network messages that indicate the user interaction with the user interface. A second portion of code for the application is executed at a node of the network other than the client. The second portion of code causes the node on which it is executing to respond to user interface messages from the client by (1) generating records that indicate changes to the user interface, and (2) transmitting the records to the first portion of code. The first portion of code responds to the messages by performing the specified changes to the user interface.