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Condition of IT structure of the big territorially distributed corporation is considered, and the developed problems are formulated. The condition of the old and new software is considered, problems of the organization of interaction of various applications, both kind of problems on management and data are formulated to. The architecture and the technologies allowing essentially to reduce complexity of interaction of applications is described, it is essential to reduce labour input, as development of new applications, and as maintenance  of old applications. The complex approach to integration allows to overcome problems of construction of the generalized environment of corporation and to reduce efforts on constant updating IT of structure (on an example of corporation the Belarus railway and integration platform IBM WebSphere).