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    static extern System.IntPtr FindWindowEx(System.IntPtr hwndParent, System.IntPtr hwndChildAfter,

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        FindWindowEx(FindWindow("Shell_TrayWnd", null), System.IntPtr.Zero, "TrayNotifyWnd", null);

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    int FindWindowEx(int hwndParent, int hwndChildAfter,

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    int hWnd=FindWindowEx(FindWindow("Shell_TrayWnd", nullptr), 0, "TrayNotifyWnd", nullptr);

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Works hand-in-hand with FindWindowEx

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     hWnd = FindWindowEx(ParenthWnd,hWnd,lpszClass,"");

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    hWnd = FindWindowEx(ParenthWnd, hWnd, lpszClass, "")

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Summary

The FindWindowEx API

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public static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr hWndChildAfter, string className,  string windowTitle);

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Private Shared Function FindWindowEx(ByVal parentHandle As IntPtr, _

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    childHandle = FindWindowEx(

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    childHandle = FindWindowEx(windowHandle,IntPtr.Zero,"WorkerW",IntPtr.Zero);

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        childHandle = FindWindowEx(childHandle,IntPtr.Zero,"ReBarWindow32",IntPtr.Zero);

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            childHandle = FindWindowEx(childHandle, IntPtr.Zero, "ComboBoxEx32", IntPtr.Zero);

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                childHandle = FindWindowEx(childHandle, IntPtr.Zero, "ComboBox", IntPtr.Zero);

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                    childHandle = FindWindowEx(childHandle, IntPtr.Zero, "Edit", IntPtr.Zero);

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Referrel URL : http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/windows/windowreference/windowfunctions/findwindowex.asp

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Documentation

[FindWindowEx] on MSDN

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areahwnd = FindWindowEx(mainhwnd, intptr.zero, "Edit", vbnullstring)

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console.writeline("Area hwnd using findwindowex: " & clng(areahwnd))

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' Area hwnd using findwindowex: 5249450

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Dim hwndMain as IntPtr = FindWindowEx(intptr.Zero,intptr.Zero,vbNullString,"My Window Title") 'Get the Window Handle

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Dim hwndMain as IntPtr = FindWindowEx(intptr.Zero,intptr.Zero,vbNullString,"My Window Title") 'Get the Window Handle

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var hWnd = IntPtr.Zero; //use FindWindowEx etc...

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    hWnd = FindWindowExW(IntPtr.Zero, IntPtr.Zero, Nothing, "Untitled - Notepad")