How do applicaitons communicate between each other

I am doing research for a term paper on ERPs, and am currently studying the architecture of Oracle E-business suite.
I have understood that there is an Application server, which is made up of one or more Tablespace(s) that contain the data from some or all of the applications. In a way, it can be look at like a wheel with the server being the hub or center while each application is a spoke of that wheel.
Yet, I have been told that an application like General ledger only pulls information from certain applications. While an application like Accounts Receivable pushes and pull form/to multiple applications. Logically, I think that either multiple Tablespaces are used and certain applications can pull form one or more specific Tablespaces, or applications can only pull certain information from a Tablespace.
So, my question in the end is; how do the applications actually communicate if data is entered into an application and if it is edited? Thank you very much in advance.

Also, you seem to have one or two basic terms and concepts mxied up. For example, Tablespace is a storage management unit, of Oracle rdbms, really unimportant when talking tables or how applications pull information. The hub and spokes concept sounds like OAI, which is an integration component of eBS/Applications.

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