public delegate int BrowseCallbackProc(IntPtr hwnd, int uMsg, IntPtr lParam, IntPtr lpData);

Public Delegate Function BrowseCallbackProc(hwnd As IntPtr, uMsg As Integer, lParam As IntPtr, lpData As IntPtr) As Integer

private delegate bool EnumWindowsProc(IntPtr hWnd, IntPtr lParam);

Private Delegate Function EnumWindowsProc(ByVal hWnd As IntPtr, ByVal lParam As IntPtr) As Boolean

If you’re going to use the lParam to return a by-value result (such as the hwnd of a window you are looking for), you’ll want to send lParam by reference:

private delegate bool EnumWindowsProc(IntPtr hWnd, ref IntPtr lParam);

Private Delegate Function EnumWindowsProc(ByVal hWnd As IntPtr, ByRef lParam As IntPtr) As Boolean

hwnd in Type: HWND A handle to the window associated with the timer.

delegate IntPtr WndProc (IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);

Delegate Function WndProc (ByVal hWnd As IntPtr, ByVal msg As Integer, _

private delegate IntPtr WndProc(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);

Private Delegate Function WndProc(ByVal hWnd As IntPtr, ByVal msg As UInteger, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As IntPtr

IntPtr hWnd = WindowFromPoint(pt);

GetWindowThreadProcessId(hWnd, out pid);

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,

  uint error = MAPILogon(hwnd, null, null, MAPI_LOGON_UI, 0, ref session);

    Private Shared Function MAPISendMail(ByVal sess As IntPtr, ByVal hwnd As IntPtr, ByVal message As MapiMessage,

    static extern int MAPISendMail(IntPtr sess, IntPtr hwnd, MapiMessage message, int flg, int rsv);

static extern bool WTSRegisterSessionNotification(IntPtr hWnd, [MarshalAs(UnmanagedType.U4)] int dwFlags);

Declare Function WTSRegisterSessionNotification Lib "wtsapi32.dll" (ByVal hWnd as IntPtr, ByVal dwFlags as Int32) As Boolean

        private static extern bool WTSRegisterSessionNotification(IntPtr hWnd, [MarshalAs(UnmanagedType.U4)]int dwFlags);

        private static extern bool WTSUnRegisterSessionNotification(IntPtr hWnd);

        Dim hwnd As IntPtr

        SetReaderModeInfo.hwnd = Me.Handle

    Public Shared Function GetScrollPos(ByVal hWnd As IntPtr, ByVal nBar As Integer) As Integer

    Private Shared Function SetScrollPos(ByVal hWnd As IntPtr, ByVal nBar As Integer, ByVal nPos As Integer, ByVal bRedraw As Boolean) As Integer

/// <param name="hwndLock">Handle to the window that owns the drag image.</param>

internal static extern bool ImageList_DragEnter(IntPtr hwndLock, int x, int y);

''' <param name="hwndLock">Handle to the window that owns the drag image.</param>

Friend Shared Function ImageList_DragEnter(hwndLock As IntPtr, x As Integer, y As Integer) As <MarshalAs(UnmanagedType.Bool)> Boolean

/// <param name="hwndLock">Handle to the window that owns the drag image.</param>

internal static extern bool ImageList_DragLeave(IntPtr hwndLock);

''' <param name="hwndLock">Handle to the window that owns the drag image.</param>

Friend Shared Function ImageList_DragLeave(hwndLock As IntPtr) As <MarshalAs(UnmanagedType.Bool)> Boolean

        public IntPtr hwndParent;

        public IntPtr hwndParent;

static extern bool CommConfigDialog(string lpszName, IntPtr hWnd,

Private Function ShowWindow(ByVal hwnd As IntPtr, ByVal nCmdShow As ShowWindowCommands) As Boolean

Dim hwnd As New IntPtr(0)

hwnd = GetConsoleWindow()

If (hwnd <> IntPtr.Zero) Then

    ShowWindow(hwnd, ShowWindowCommands.ShowMinimized)

  SetPriorityClass(mhHwnd, CType(20, System.IntPtr))    '20 = high !!

      public IntPtr hwndParent;

    credui.hwndParent = this.Handle;

     public IntPtr hwndParent;

    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

     [In] IntPtr hwnd);

    void SetWindow(IntPtr hwnd, ref RECT rect);

    void QueryFocus(out IntPtr phwnd);

    IntPtr hwndEdit,

Declare Function SHAutoComplete Lib "shlwapi.dll" (ByVal hWndEdit As IntPtr, ByVal dwFlags As AutoCompleteFlags) As Integer

    [In] IntPtr hwnd,

    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);