application to application (A2A)
Automatic data exchange between applications( A2A) is a form of enterprise application integration( EAI) in middleware. A2A is a communication relationship between two applications, whereas business to business( B2B) is part of the business process within the value chain.
In A2A (Application to Application), two application programs automatically exchange their data with each other. The idea is that information from one application flows into a second via a defined interface.
A2A applications can run internally in a company, for example, when a database provides the addresses for a serial letter and the text program provides the letter. Another example could be construction drawings in which graphic components or calculation modules from a database flow in. In the administrative area for example turnovers or other enterprise characteristic values are used in a Data Warehouse( DWH) or with the Data Mining( DM).