In various embodiments, a system is provided for building configurable applications. The system may include a distributed tier with a presentation module accessible by a user which is configured to permit configuration of an interface in a session with the user and an interface module configured to process session state data in an extensible language format. The system may also include a mainframe system having an enterprise architecture integration (EAI) framework configured for receiving the extensible language formatted state data and invoking at least one service in association with evaluating the extensible language formatted state data and a business rules engine based on an extensible language format. The mainframe system may be configured to translate the evaluated state data into a reply message based on the extensible language format.
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