Middleware
Middleware is a software technology that connects two otherwise separate applications. For example, there are a number of middleware products that link a database system to a Web server. This allows users to request data from the database using forms displayed on a Web browser, and it enables the Web server to return dynamic Web pages based on the user's requests and profile. Common middleware categories include:

• ESBs
• TP monitors
• DCE environments
• RPC systems
• Object Request Brokers (ORBs)
• Database access systems
• Message Passing

Overview of middleware
Middleware is the "glue" that connects diverse computer systems. Typically, legacy systems store information in proprietary formats, use propriety protocols to communicate, and may even be running on hardware that's no longer manufactured or supported. Middleware can solve a problem like when a 20 year old system needs to be integrated with a modern Web application.

Interoperable middleware between organizations is a particular need of higher education...