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Legacy Integration Components

1) A Thin Client, which is a software application designed to work with many different applications. An ideal thin client is a web browser.

2) Many legacy systems require specially written stacks or gateways to translate existent protocols into TCP/IP.

3) The most generic definition of an application server is any service or daemon that connects directly with back-end items (such as databases and legacy systems). Generally a web server passes information from the user to an application server, which communicates with the database or legacy systems.

4) Common Object Request Broker Architecture : A language specially designed to mitigate between other languages. For example, you would use to communicate between COBOL and Java.
More on this topic can be found on the following website.Corba Fundamentals