2.1 What are the business requirements?2.1.1 Basic concepts and design forces: A gentle introduction2.1.2 Conclusion2.2 Secure cooperation with business partners2.2.1 Technical security function2.2.2 Gateway function2.2.3 Technology choices2.2.4 Small enterprises2.2.5 Medium and large enterprises2.3 Seamless integration inside the enterprise2.3.1 Connectivity matters: Messaging2.3.2 WebSphere MQ2.3.3 Enterprise Service Bus (ESB): Enabler for Service Oriented Architecture2.3.4 IBM ESB products2.3.5 Technology choices2.3.6 Small enterprises2.3.7 Medium and large enterprises