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The SAP application window (technically called a session) is a graphical user interface or GUI with which you communicate and interact with the SAP system. This interaction occurs on three types of screens that are displayed within the frame of the application window:
The SAP Easy Access screen, which is the default home page of the system and the starting point for most transactions
The initial screens of transactions, where you set up and execute transactions
The output screens of transactions, where the system displays the results of transactions to you