The invention relates to a system and a process data processing on the Internet consisting in providing and distributing services relative to complex sales transactions, in particular in the real estate, the insurances and other fields with multicompos閑s transactions. The traditional real transaction is a relatively complex operation which requires on behalf of many parts that they bring the parts necessary to the transaction within limited times. The invention relates to a computerized central desk (inter alia) intended to offer this service type, and including/understanding a system of personalized affiliation, an intelligent system of treatment of documents, an intelligent system of routing of the orders, a history of the orders and a system of update, utility programs such as display boards and repertories, functions making it possible to manage a complex system, a system of active answer, automatic functions of waiter, and a system of treatment of integrated contracts.