A network-based computing system that automates, simplifies, and optimizes the compilation, deployment, and execution of an application by any type of a client machine connected to a server via any type of a network connection. The system includes a client runtime environment, a server runtime environment and an object-oriented markup-business logic binding mechanism. The client runtime environment manages client side code and screen definitions. The server runtime environment dynamical compiles code to ensure client platform compatibility. The system delivers network applications on demand, by separating them into lightweight modules and delivering these modules.