The present invention is related to a host system for full customization of functional process logic in an integrated system having multiple nodes, each node being independent of other nodes in said system, said system capable of handling standard markup language data. The system has functional process logic that uses one of agents and agent management services approach and a payload processor approach. Each unit of functional process logic is a service, multiple services are grouped together to form an agent, and incoming standard markup language data is processed as a document object method and system for facilitating the integration of a plurality of dissimilar systems by allowing networks of integration framework installations and/or other compatible B2B servers to inter-operate across corporate enterprise boundaries to integrate the disparate systems operating within each corporate enterprise. In the payload processor approach the functional process logic units are tied to predefined elements within the incoming standard markup language data document and processed used an event based model. The functional process logic uses a web-based scripting language which allows for remote administration and customization of the functional process logic. The API of the host system is in code accessible to the web-based scripting language used.