Private Declare Auto Function FindWindow Lib "user32" ( ByVal lpClassName As String, ByVal lpWindowName As String) As IntPtr

    'abd.hWnd = FindWindow("Shell_TrayWnd", "") 'Tasbar Handle

        ABD.hWnd = FindWindow("Shell_TrayWnd", "")

    static extern System.IntPtr FindWindow(string lpClassName, string lpWindowName);

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

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

    int FindWindow(String^ lpClassName, String^ lpWindowName);

    int FindWindowEx(int hwndParent, int hwndChildAfter,

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

IntPtr hwnd = FindWindowByCaption((IntPtr)null, "Untitled - Notepad");

static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

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

Private Shared Function FindWindowEx(ByVal parentHandle As IntPtr, _

    childHandle = FindWindowEx(

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

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

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

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

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

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

static extern TODO FindWindowA(TODO);

Declare Function FindWindowA Lib "user32.dll" (TODO) As TODO

static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

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

Private Shared Function FindWindowEx(ByVal parentHandle As IntPtr, _

    childHandle = FindWindowEx(

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

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

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

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

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

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

Here is an alternative Managed API to FindWindow, The article also describes a way to CloseWindow of another process like notepad, not sure if there is such thing in Win32 API, but at least you can do it in .NET! Here is the article:

IntPtr hWnd = FindWindow("WindowClass", "WindowName");

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

IntPtr hWnd = FindWindow("WindowClass", "WindowName");

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

        public static extern IntPtr FindWindow( string sClsName , string sWndName );

            IntPtr Hwnd = FindWindow( null , "Form1" );

Use FindWindow and SetForegroundWindow to direct input to the desired window.

  SetForegroundWindow (FindWindow('Untitled - Notepad'))

    'Note: this example also uses API calls to FindWindow, GetDlgItemText, and SetActiveWindow.

    theDialogBoxHandle = FindWindow(theDialogBoxClassName, theDialogBoxTitle)

   var hWindow = Api.user32.FindWindow("notepad", null);

            int hWnd = FindWindow(windowName, wait);

        // THE FOLLOWING METHOD REFERENCES THE FindWindowAPI

        public static int FindWindow(string windowName, bool wait)

            int hWnd = FindWindow(null, windowName);

                hWnd = FindWindow(null, windowName);

Here is an alternative Managed API to FindWindow, The article also describes a way to CloseWindow of another process like notepad, not sure if there is such thing in Win32 API, but at least you can do it in .NET! Here is the article:

    /*SetParent(FindWindow(vbnullstring,"notepad.exe"),me.handle)

[DllImport("coredll.dll", EntryPoint="FindWindowW", SetLastError=true)]

private static extern IntPtr FindWindowCE(string lpClassName, string lpWindowName);

Public Declare Function FindWindow Lib "Coredll" Alias "FindWindowW" (ByVal lpClassName As String, ByVal lpWindowName As String) As IntPtr

        handle = FindWindowCE("HHTaskBar", null);

        handle = FindWindowCE("HHTaskBar", null);

        handle = FindWindowW("HHTaskBar", null);

        handle = FindWindowW("HHTaskBar", null);