The AccessibleObjectFromEvent function retrieves the address of the IAccessible interface for the object that generated the event. The event is the one that the client's event hook function is currently processing.
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The IAccessible interface is the heart of Microsoft Active Accessibility. Applications implement this Component Object Model (COM) interface to represent their custom user interface elements, which can include their client area as accessible objects, if necessary. Client applications call IAccessible methods and properties to obtain information about an application's user interface and data.