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    public interface IAccessibleObject

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    Public Interface IAccessibleObject

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public static extern uint AccessibleChildren( IAccessible paccContainer, int iChildStart, int cChildren, [Out] object[] rgvarChildren, out int pcObtained);

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Declare Function AccessibleChildren Lib "oleacc.dll" (ByVal paccContainer As IAccessible, ByVal iChildStart As Integer, ByVal cChildren As Integer, <[Out]()> ByVal rgvarChildren() As Object, ByRef pcObtained As Integer) As UInteger

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Function AccessibleChildren(ByVal paccContainer As IAccessible, ByVal iChildStart As Integer, ByVal cChildren As Integer, <[Out]()> ByVal rgvarChildren() As Object, ByRef pcObtained As Integer) As UInteger

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IAccessible accessible = null;

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Summary

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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public static extern uint AccessibleObjectFromEvent( IntPtr hwnd, uint dwObjectID, uint dwChildID, out IAccessible ppacc, [MarshalAs(UnmanagedType.Struct)] out object pvarChild);

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    private static IAccessible GetFocusedAccessibleWindowFromHandle()

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        IAccessible accWindow = null;

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        out IAccessible ppacc, [MarshalAs(UnmanagedType.Struct)] out object pvarChild);

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Summary

The AccessibleObjectFromPoint function retrieves the address of the IAccessible interface pointer for the object at a specified point on the screen.

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public static extern IntPtr AccessibleObjectFromPoint(POINT pt, [Out, MarshalAs(UnmanagedType.Interface)] out IAccessible accObj, [Out] out object ChildID);

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This function retrieves the lowest-level accessible object in the object hierarchy at the given point specified in screen coordinates where 0, 0 is the upper left corner. If the element at the point is not an accessible object (that is, does not support IAccessible), then the function retrieves the IAccessible interface of the parent object. The parent object must provide information about the child element through the IAccessible interface.

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public static IAccessible GetAccessibleObject(POINT pt, out int ChildID)

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     IAccessible accObj;

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Summary

The AccessibleObjectFromPoint function retrieves the address of the IAccessible interface pointer for the object at a specified point on the screen.

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public static extern IntPtr AccessibleObjectFromPoint(POINT pt, [Out, MarshalAs(UnmanagedType.Interface)] out IAccessible accObj, [Out] out object ChildID);

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    Shared Function AccessibleObjectFromPoint(ByVal pt As Point, <MarshalAs(UnmanagedType.Interface)> ByRef accObj As IAccessible, ByRef ChildID As Object) As IntPtr

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This function retrieves the lowest-level accessible object in the object hierarchy at a given point in screen coordinates where (0, 0) is the upper left corner. If the element at the point is not an accessible object (that is, does not support IAccessible), then the function retrieves the IAccessible interface of the parent object. The parent object must provide information about the child element through the IAccessible interface.

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public static IAccessible GetAccessibleObject(POINT pt, out int ChildID)

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     IAccessible accObj;

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    Dim varChild As Accessibility.IAccessible

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    accessible = (IAccessible) obj;

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Summary

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.

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static extern TODO IAccessible(TODO);

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Declare Function IAccessible Lib "oleacc.dll" (TODO) As TODO

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For c# use Accessibility Namespace there you'll find IAccessible interface.

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Documentation

[IAccessible] on MSDN

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The WindowFromAccessibleObject function retrieves the window handle that corresponds to a given instance of an IAccessible interface.

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public static extern uint WindowFromAccessibleObject(IAccessible pacc, ref IntPtr phwnd );

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Declare Function WindowFromAccessibleObject Lib "oleacc.dll" (ByVal pacc as IAccessible, ByRef phwnd as IntPtr) As Integer

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    static Accessibility.IAccessible iAccessible;//interface: Accessibility namespace

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        handler = AccessibleObjectFromPoint(location,out iAccessible,out ChildId);

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        WindowFromAccessibleObject(iAccessible, ref handler);

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        if (iAccessible != null && ChildId != null)

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        return iAccessible.get_accName(ChildId);

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    public static extern IntPtr AccessibleObjectFromPoint(MouseHook.POINT pt, [Out, MarshalAs(UnmanagedType.Interface)] out IAccessible accObj, [Out] out object ChildID);

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    public static extern uint WindowFromAccessibleObject(IAccessible pacc, ref IntPtr phwnd);

. * Servers must ensure that all child objects are fully created and ready to accept IAccessible calls from clients before . * before calling IAccessible::get_accParent, particularly if in-context hook functions are used. . * After receiving this event, clients do not call an object's IAccessible properties or methods. However, the interface pointer . * queries for the selected items by calling the container object's IAccessible::get_accSelection method and