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What is a Window? Is it Microsoft Windows Operating System? The answer is No. A Window in PowerBuilder world is a screen. It is the main interface between the user and the application you develop. Do not confuse it with MS-Windows. Whenever we refer to Microsoft Windows, we always refer as MS-Windows.
Window is the place where the end-user does the query and sees the report, does the data entry and so on. A window itself doesn't do all these things, instead a Window acts as a placeholder for some controls. There are few controls that the window allows you to place on it. For example, a control to allow you to enter your name, a control that allows you to close the window and so on.
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