The report has two messages: (1) Network solutions require special software methodology, and (2) Successful information management in platform networks require open systems solutions plus simple basic principles and flexible building stones. High quality software architecture is a fundamental requirement for cooperation tools to be used by operators in mobile platforms in defence applications. Forms and content for such an architecture are discussed. The goal is to identify methods and services that support operators in platforms of different kinds aiming to cooperate in common tasks. Examples of such services are given. The proposed architecture is concretized with a self-developed tool for platform based data fusion and sensor management. A data fusion node coordinates these processes. Competing sensor tasks that ask for the same resources are generated by operators and platform based subsystems concurrently. Multi agent technology is used to model these tasks. A framework for network oriented software is fundamental for external communication.