IntPtr hWndCaller,

     ByVal hWndCaller As IntPtr, ByVal pszFile As String, _

        IntPtr hWndCaller,

    public IntPtr hwndOwner;

     Public hwndOwner As IntPtr

   public IntPtr hwnd;

• Desktop handle to the window specified by hwnd. This is returned only if BroadcastSystemMessageEx specifies BSF_RETURNHDESK and BSF_QUERY.

• hwnd

        public IntPtr        hwnd;          // might be NULL (indicating no owner window)

    public IntPtr hwndCombo;

    public IntPtr hwndEdit;

    public IntPtr hwndList;

    hwndCombo As Long

    hwndEdit As Long

    hwndList As Long

   SendMessage(hWnd, WM_COPYDATA, IntPtr.Zero, copyDataBuff);

        public IntPtr hwndParent;

        Public hwndParent As IntPtr

            public IntPtr hwndParent;

    Public hwndParent As IntPtr

    public IntPtr hwndApp;

    Public hwndApp As IntPtr

     IntPtr hWnd;

        public IntPtr hwnd;

        Public hWnd As IntPtr

    public IntPtr hwnd;

    Public hwnd As IntPtr

    public IntPtr        hwndActive;

    public IntPtr        hwndFocus;

    public IntPtr        hwndCapture;

    public IntPtr        hwndMenuOwner;

    public IntPtr        hwndMoveSize;

    public IntPtr        hwndCaret;

    Public hwndActive As IntPtr

    Public hwndFocus As IntPtr

    Public hwndCapture As IntPtr

    Public hwndMenuOwner As IntPtr

    Public hwndMoveSize As IntPtr

    Public hwndCaret As IntPtr

    public IntPtr hwnd;

    public IntPtr hwnd;

    public IntPtr hwndOwner;

   public IntPtr hwndFrom;

   Public hwndFrom As IntPtr

    /// taskbar status area. The Shell uses hWnd and uID to identify which icon to operate on

    public IntPtr hwnd;

    /// Application-defined identifier of the taskbar icon. The Shell uses hWnd and uID to identify

    /// associated with a single hWnd by assigning each a different uID.

    /// notifications to the window identified in hWnd.

    public IntPtr hWnd;

    Dim hWnd As IntPtr

   public IntPtr hWnd;

    int hwndOwner;

    Public hwndOwner As IntPtr  

   public IntPtr hwndOwner;

    Public hwndOwner As IntPtr

    public IntPtr hwndOwner;        

   public int hwndParent = 0;

        Dim hwnd As IntPtr

        Dim hwnd As IntPtr

        SetReaderModeInfo.hwnd = Me.Handle

        public IntPtr hwndChild;

    public IntPtr hwnd;

     Public hwnd As IntPtr

     hWnd As Long

• Always set hwnd to my main app window (I was using IntPtr.Zero, this might not be required)
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29

        public static extern bool GetTitleBarInfo(IntPtr hwnd, ref TITLEBARINFO pti);

   public IntPtr hwnd;

    Public hwnd As IntPtr

   public IntPtr  hwndTrack;

   Public hwndTrack As IntPtr

        public IntPtr hwnd;

        public IntPtr hwndInsertAfter;

        Public hwnd As IntPtr

        Public hwndInsertAfter As IntPtr

    static extern System.UInt16  SetWindowRgn(IntPtr hWnd, IntPtr hRgn, bool bRedraw);

        static extern IntPtr GetDC(IntPtr hWnd);

        static extern IntPtr GetDC(IntPtr hWnd);

            Graphics graphics = Graphics.FromHwnd(IntPtr.Zero);

            Graphics graphics = Graphics.FromHwnd(IntPtr.Zero);

    Graphics vGraphics = Graphics.FromHwnd(Handle);

        static extern IntPtr GetDC(IntPtr hWnd);

        using (System.Drawing.Graphics g = System.Drawing.Graphics.FromHwnd(IntPtr.Zero))

        Using g As System.Drawing.Graphics = System.Drawing.Graphics.FromHwnd(IntPtr.Zero)

        Graphics g = Graphics.FromHwnd(IntPtr.Zero);

  static extern IntPtr GetDC(IntPtr hwnd);

  static extern Int32 ReleaseDC(IntPtr hwnd, IntPtr hdc);

      static extern IntPtr GetDC(IntPtr hwnd);

      static extern Int32 ReleaseDC(IntPtr hwnd, IntPtr hdc);

    private static IntPtr HWND_BROADCAST = new IntPtr(0xffff);

    private static IntPtr HWND_TOP = new IntPtr(0);

    private static IntPtr HWND_BOTTOM = new IntPtr(1);

    private static IntPtr HWND_TOPMOST = new IntPtr(-1);

    private static IntPtr HWND_NOTOPMOST = new IntPtr(-2);

    private static IntPtr HWND_MESSAGE = new IntPtr(-3);

    private static extern int SendMessage(IntPtr hWnd, WindowsMessages wMsg, IntPtr wParam, IntPtr lParam);

        long result = SendMessage(HWND_BROADCAST, WindowsMessages.WM_FONTCHANGE, IntPtr.Zero, IntPtr.Zero);

public static extern IntPtr GetDC(IntPtr hWnd);

public static extern IntPtr GetDC(IntPtr hWnd);

    Graphics vGraphics = Graphics.FromHwnd(Handle);

    Using G = Graphics.FromHwnd(Me.Handle)

static extern bool DwmDefWindowProc(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam, ref IntPtr plResult);

Private Shared Function DwmDefWindowProc(ByVal hWnd As IntPtr, ByVal msg As Integer, ByVal wParam As IntPtr, ByVal lParam As IntPtr, ByRef plResult As IntPtr) As Integer

static extern void DwmEnableBlurBehindWindow(IntPtr hwnd, ref DWM_BLURBEHIND blurBehind);

Private Shared Sub DwmEnableBlurBehindWindow(ByVal hwnd As IntPtr, ByRef blurBehind As DWM_BLURBEHIND)

static extern int DwmExtendFrameIntoClientArea(IntPtr hwnd, ref MARGINS margins);

Private Shared Function DwmExtendFrameIntoClientArea(ByVal hwnd As IntPtr, ByRef margins As MARGINS) As Integer

static extern int DwmGetWindowAttribute(IntPtr hwnd, DWMWINDOWATTRIBUTE dwAttribute, out bool pvAttribute, int cbAttribute);

static extern int DwmGetWindowAttribute(IntPtr hwnd, DWMWINDOWATTRIBUTE dwAttribute, out RECT pvAttribute, int cbAttribute);

private static extern void PrintUIEntryW(IntPtr hwnd, IntPtr hinst, string lpszCmdLine, int nCmdShow);

    public IntPtr hwndOwner;

    public IntPtr hwndOwner;

private static extern int WNetAddConnection3(IntPtr hWndOwner,

    ''' <param name="hWndOwner"></param>

    Private Shared Function WNetAddConnection3(ByVal hWndOwner As IntPtr, _

WNetAddConnection3(hWnd, ref ConnInf, null, null,

private static extern int WNetAddConnection3(IntPtr hWndOwner,

    ''' <param name="hWndOwner"></param>

    Private Shared Function WNetAddConnection3(ByVal hWndOwner As IntPtr, _

WNetAddConnection3(hWnd, ref ConnInf, null, null,

    IntPtr      hwndOwner,

    //        HWND hWnd;

    public IntPtr hWnd;

    public IntPtr hWnd;

    Public hWnd As IntPtr

    public IntPtr hWnd;

  myBarData.hWnd = MyBar.Handle;

static extern void DragAcceptFiles(IntPtr hwnd, bool fAccept);

    ByVal hwnd As Long, _

     void AddTab(IntPtr hwnd);

     void DeleteTab(IntPtr hwnd);

     void ActivateTab(IntPtr hwnd);

     void SetActiveAlt(IntPtr hwnd);

     IntPtr hwnd,

     void SetProgressValue(IntPtr hwnd, UInt64 ullCompleted, UInt64 ullTotal);

     void SetProgressState(IntPtr hwnd, TaskbarProgressBarStatus tbpFlags);

     void RegisterTab(IntPtr hwndTab, IntPtr hwndMDI);

     void UnregisterTab(IntPtr hwndTab);

     void SetTabOrder(IntPtr hwndTab, IntPtr hwndInsertBefore);

     void SetTabActive(IntPtr hwndTab, IntPtr hwndInsertBefore, uint dwReserved);

     IntPtr hwnd,

     IntPtr hwnd,

     void ThumbBarSetImageList(IntPtr hwnd, IntPtr himl);

       IntPtr hwnd,

     IntPtr hwnd,

     IntPtr hwnd,

     void SetTabProperties(IntPtr hwndTab, SetTabPropertiesOption stpFlags);

    Sub AddTab(hwnd As IntPtr)

    Sub DeleteTab(hwnd As IntPtr)

    Sub ActivateTab(hwnd As IntPtr)

    Sub SetActiveAlt(hwnd As IntPtr)

    Sub MarkFullscreenWindow(hwnd As IntPtr, <MarshalAs(UnmanagedType.Bool)> fFullscreen As Boolean)

    Sub SetProgressValue(hwnd As IntPtr, ullCompleted As UInt64, ullTotal As UInt64)

    Sub SetProgressState(hwnd As IntPtr, tbpFlags As TaskbarProgressBarStatus)

    Sub RegisterTab(hwndTab As IntPtr, hwndMDI As IntPtr)

    Sub UnregisterTab(hwndTab As IntPtr)

    Sub SetTabOrder(hwndTab As IntPtr, hwndInsertBefore As IntPtr)

    Sub SetTabActive(hwndTab As IntPtr, hwndInsertBefore As IntPtr, dwReserved As UInteger)

    Function ThumbBarAddButtons(hwnd As IntPtr, cButtons As UInteger, <MarshalAs(UnmanagedType.LPArray)> pButtons As ThumbButton()) As HResult

    Function ThumbBarUpdateButtons(hwnd As IntPtr, cButtons As UInteger, <MarshalAs(UnmanagedType.LPArray)> pButtons As ThumbButton()) As HResult

    Sub ThumbBarSetImageList(hwnd As IntPtr, himl As IntPtr)

    Sub SetOverlayIcon(hwnd As IntPtr, hIcon As IntPtr, <MarshalAs(UnmanagedType.LPWStr)> pszDescription As String)

    Sub SetThumbnailTooltip(hwnd As IntPtr, <MarshalAs(UnmanagedType.LPWStr)> pszTip As String)

    Sub SetThumbnailClip(hwnd As IntPtr, prcClip As IntPtr)

    Sub SetTabProperties(hwndTab As IntPtr, stpFlags As SetTabPropertiesOption)

    /// <param name="hWnd"></param>

    void MarkFullscreenWindow([In] IntPtr hWnd, [In] int fFullscreen);

    /// <param name="hWnd">A handle to the window to be added to the taskbar.</param>

    void AddTab(IntPtr hWnd);

    /// <param name="hWnd">A handle to the window to be deleted from the taskbar.</param>

    void DeleteTab(IntPtr hWnd);

    /// <param name="hWnd">A handle to the window on the taskbar to be displayed as active.</param>

    void ActivateTab(IntPtr hWnd);

    /// <param name="hWnd">A handle to the window to be marked as active.</param>

    void SetActiveAlt(IntPtr hWnd);

    /// <param name="hWnd"></param>

    void MarkFullscreenWindow(IntPtr hWnd, int fFullscreen);

    /// <param name="hWnd">The handle of the window whose associated taskbar button is being used as

    void SetProgressValue(IntPtr hWnd, ulong ullCompleted, ulong ullTotal);

    /// <param name="hWnd">The handle of the window in which the progress of an operation is being

    void SetProgressState(IntPtr hWnd, TBPFLAG tbpFlags);

    /// <param name="hWndTab">Handle of the tab or document window. This value is required and cannot

    /// <param name="hWndMDI">Handle of the application's main window. This value tells the taskbar

    void RegisterTab(IntPtr hWndTab, IntPtr hWndMDI);

    /// <param name="hWndTab">The handle of the tab window whose thumbnail is being removed. This is the same

    void UnregisterTab(IntPtr hWndTab);

    /// <param name="hWndTab">The handle of the tab window whose thumbnail is being placed. This value

    /// <param name="hWndInsertBefore">The handle of the tab window whose thumbnail that hwndTab is

    void SetTabOrder(IntPtr hWndTab, IntPtr hWndInsertBefore);

    /// <param name="hWndTab">Handle of the active tab window. This handle must already be registered

    /// <param name="hWndMDI">Handle of the application's main window. This value tells the taskbar

    void SetTabActive(IntPtr hWndTab, IntPtr hWndMDI, UInt32 tbatFlags);

    /// <param name="hWnd">The handle of the window whose thumbnail representation will receive the toolbar.

    IntPtr hWnd,

    IntPtr hWnd,

    /// <param name="hWnd">The handle of the window whose thumbnail representation contains the toolbar to be

    void ThumbBarSetImageList(IntPtr hWnd, IntPtr himl);

    /// <param name="hWnd">The handle of the window whose associated taskbar button receives the overlay.

    /// a valid HWND or the call is ignored.</param>

    void SetOverlayIcon(IntPtr hWnd, IntPtr hIcon, string pszDescription);

    /// <param name="hWnd">The handle to the window whose thumbnail displays the tooltip. This handle must

    /// in which case the title of the window specified by hwnd is used as the tooltip.</param>

    void SetThumbnailTooltip(IntPtr hWnd, string pszTip);

    /// <param name="hWnd">The handle to a window represented in the taskbar.</param>

    void SetThumbnailClip(IntPtr hWnd, IntPtr prcClip);

     void AddTab(IntPtr hwnd);

     void DeleteTab(IntPtr hwnd);

     void ActivateTab(IntPtr hwnd);

     void SetActiveAlt(IntPtr hwnd);

     IntPtr hwnd,

     void SetProgressValue(IntPtr hwnd, UInt64 ullCompleted, UInt64 ullTotal);

     void SetProgressState(IntPtr hwnd, TaskbarProgressBarStatus tbpFlags);

     void RegisterTab(IntPtr hwndTab, IntPtr hwndMDI);

     void UnregisterTab(IntPtr hwndTab);

     void SetTabOrder(IntPtr hwndTab, IntPtr hwndInsertBefore);

     void SetTabActive(IntPtr hwndTab, IntPtr hwndInsertBefore, uint dwReserved);

     IntPtr hwnd,

     IntPtr hwnd,

     void ThumbBarSetImageList(IntPtr hwnd, IntPtr himl);

       IntPtr hwnd,

     IntPtr hwnd,

     IntPtr hwnd,

     void SetTabProperties(IntPtr hwndTab, SetTabPropertiesOption stpFlags);