Middleware

'''How can middleware be used to integrate information systems? Draw''' From Wikipedia:
 * Data Warehouse
 * Multi-Database Systems

Middleware is computer software that consists of a set of services that allows multiple processes running on one or more machines to interact. This technology evolved to provide for interoperability in support of the move to coherent distributed architectures, which are most often used to support and simplify complex distributed applications. It includes web servers, application servers, and similar tools that support application development and delivery. Middleware is especially integral to modern information technology based on XML, SOAP, Web services, and service-oriented architecture.