Задать положение курсора используя WinApi

Imports System.Runtime.InteropServices
Imports System.Threading
 
Public Class Form1
 
    <DllImport("user32.dll", SetLastError:=True, CharSet:=CharSet.Auto)> _
    Private Shared Function PostMessage(ByVal hWnd As IntPtr, ByVal Msg As UInteger, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As Boolean
    End Function
 
    <DllImport("user32.dll", SetLastError:=True, CharSet:=CharSet.Auto)> _
    Private Shared Function FindWindow( _
     ByVal lpClassName As String, _
     ByVal lpWindowName As String) As IntPtr
    End Function
 
    Public Enum WndMsg
        WM_ACTIVATE = &H6
        WM_ACTIVATEAPP = &H1C
        WM_AFXFIRST = &H360
        WM_AFXLAST = &H37F
        WM_APP = &H8000
        WM_ASKCBFORMATNAME = &H30C
        WM_CANCELJOURNAL = &H4B
        WM_CANCELMODE = &H1F
        WM_CAPTURECHANGED = &H215
        WM_CHANGECBCHAIN = &H30D
        WM_CHANGEUISTATE = &H127
        WM_CHAR = &H102
        WM_CHARTOITEM = &H2F
        WM_CHILDACTIVATE = &H22
        WM_CLEAR = &H303
        WM_CLOSE = &H10
        WM_COMMAND = &H111
        WM_COMPACTING = &H41
        WM_COMPAREITEM = &H39
        WM_CONTEXTMENU = &H7B
        WM_COPY = &H301
        WM_COPYDATA = &H4A
        WM_CREATE = &H1
        WM_CTLCOLORBTN = &H135
        WM_CTLCOLORDLG = &H136
        WM_CTLCOLOREDIT = &H133
        WM_CTLCOLORLISTBOX = &H134
        WM_CTLCOLORMSGBOX = &H132
        WM_CTLCOLORSCROLLBAR = &H137
        WM_CTLCOLORSTATIC = &H138
        WM_CUT = &H300
        WM_DEADCHAR = &H103
        WM_DELETEITEM = &H2D
        WM_DESTROY = &H2
        WM_DESTROYCLIPBOARD = &H307
        WM_DEVICECHANGE = &H219
        WM_DEVMODECHANGE = &H1B
        WM_DISPLAYCHANGE = &H7E
        WM_DRAWCLIPBOARD = &H308
        WM_DRAWITEM = &H2B
        WM_DROPFILES = &H233
        WM_ENABLE = &HA
        WM_ENDSESSION = &H16
        WM_ENTERIDLE = &H121
        WM_ENTERMENULOOP = &H211
        WM_ENTERSIZEMOVE = &H231
        WM_ERASEBKGND = &H14
        WM_EXITMENULOOP = &H212
        WM_EXITSIZEMOVE = &H232
        WM_FONTCHANGE = &H1D
        WM_GETDLGCODE = &H87
        WM_GETFONT = &H31
        WM_GETHOTKEY = &H33
        WM_GETICON = &H7F
        WM_GETMINMAXINFO = &H24
        WM_GETOBJECT = &H3D
        WM_GETTEXT = &HD
        WM_GETTEXTLENGTH = &HE
        WM_HANDHELDFIRST = &H358
        WM_HANDHELDLAST = &H35F
        WM_HELP = &H53
        WM_HOTKEY = &H312
        WM_HSCROLL = &H114
        WM_HSCROLLCLIPBOARD = &H30E
        WM_ICONERASEBKGND = &H27
        WM_IME_CHAR = &H286
        WM_IME_COMPOSITION = &H10F
        WM_IME_COMPOSITIONFULL = &H284
        WM_IME_CONTROL = &H283
        WM_IME_ENDCOMPOSITION = &H10E
        WM_IME_KEYDOWN = &H290
        WM_IME_KEYLAST = &H10F
        WM_IME_KEYUP = &H291
        WM_IME_NOTIFY = &H282
        WM_IME_REQUEST = &H288
        WM_IME_SELECT = &H285
        WM_IME_SETCONTEXT = &H281
        WM_IME_STARTCOMPOSITION = &H10D
        WM_INITDIALOG = &H110
        WM_INITMENU = &H116
        WM_INITMENUPOPUP = &H117
        WM_INPUTLANGCHANGE = &H51
        WM_INPUTLANGCHANGEREQUEST = &H50
        WM_KEYDOWN = &H100
        WM_KEYFIRST = &H100
        WM_KEYLAST = &H108
        WM_KEYUP = &H101
        WM_KILLFOCUS = &H8
        WM_LBUTTONDBLCLK = &H203
        WM_LBUTTONDOWN = &H201
        WM_LBUTTONUP = &H202
        WM_MBUTTONDBLCLK = &H209
        WM_MBUTTONDOWN = &H207
        WM_MBUTTONUP = &H208
        WM_MDIACTIVATE = &H222
        WM_MDICASCADE = &H227
        WM_MDICREATE = &H220
        WM_MDIDESTROY = &H221
        WM_MDIGETACTIVE = &H229
        WM_MDIICONARRANGE = &H228
        WM_MDIMAXIMIZE = &H225
        WM_MDINEXT = &H224
        WM_MDIREFRESHMENU = &H234
        WM_MDIRESTORE = &H223
        WM_MDISETMENU = &H230
        WM_MDITILE = &H226
        WM_MEASUREITEM = &H2C
        WM_MENUCHAR = &H120
        WM_MENUCOMMAND = &H126
        WM_MENUDRAG = &H123
        WM_MENUGETOBJECT = &H124
        WM_MENURBUTTONUP = &H122
        WM_MENUSELECT = &H11F
        WM_MOUSEACTIVATE = &H21
        WM_MOUSEFIRST = &H200
        WM_MOUSEHOVER = &H2A1
        WM_MOUSELAST = &H20D
        WM_MOUSELEAVE = &H2A3
        WM_MOUSEMOVE = &H200
        WM_MOUSEWHEEL = &H20A
        WM_MOUSEHWHEEL = &H20E
        WM_MOVE = &H3
        WM_MOVING = &H216
        WM_NCACTIVATE = &H86
        WM_NCCALCSIZE = &H83
        WM_NCCREATE = &H81
        WM_NCDESTROY = &H82
        WM_NCHITTEST = &H84
        WM_NCLBUTTONDBLCLK = &HA3
        WM_NCLBUTTONDOWN = &HA1
        WM_NCLBUTTONUP = &HA2
        WM_NCMBUTTONDBLCLK = &HA9
        WM_NCMBUTTONDOWN = &HA7
        WM_NCMBUTTONUP = &HA8
        WM_NCMOUSEMOVE = &HA0
        WM_NCPAINT = &H85
        WM_NCRBUTTONDBLCLK = &HA6
        WM_NCRBUTTONDOWN = &HA4
        WM_NCRBUTTONUP = &HA5
        WM_NCUAHDRAWCAPTION = &HAE
        WM_NCUAHDRAWFRAME = &HAF
        WM_NEXTDLGCTL = &H28
        WM_NEXTMENU = &H213
        WM_NOTIFY = &H4E
        WM_NOTIFYFORMAT = &H55
        WM_NULL = &H0
        WM_PAINT = &HF
        WM_PAINTCLIPBOARD = &H309
        WM_PAINTICON = &H26
        WM_PALETTECHANGED = &H311
        WM_PALETTEISCHANGING = &H310
        WM_PARENTNOTIFY = &H210
        WM_PASTE = &H302
        WM_PENWINFIRST = &H380
        WM_PENWINLAST = &H38F
        WM_POWER = &H48
        WM_POWERBROADCAST = &H218
        WM_PRINT = &H317
        WM_PRINTCLIENT = &H318
        WM_QUERYDRAGICON = &H37
        WM_QUERYENDSESSION = &H11
        WM_QUERYNEWPALETTE = &H30F
        WM_QUERYOPEN = &H13
        WM_QUEUESYNC = &H23
        WM_QUIT = &H12
        WM_RBUTTONDBLCLK = &H206
        WM_RBUTTONDOWN = &H204
        WM_RBUTTONUP = &H205
        WM_RENDERALLFORMATS = &H306
        WM_RENDERFORMAT = &H305
        WM_SETCURSOR = &H20
        WM_SETFOCUS = &H7
        WM_SETFONT = &H30
        WM_SETHOTKEY = &H32
        WM_SETICON = &H80
        WM_SETREDRAW = &HB
        WM_SETTEXT = &HC
        WM_SETTINGCHANGE = &H1A
        WM_SHOWWINDOW = &H18
        WM_SIZE = &H5
        WM_SIZECLIPBOARD = &H30B
        WM_SIZING = &H214
        WM_SPOOLERSTATUS = &H2A
        WM_STYLECHANGED = &H7D
        WM_STYLECHANGING = &H7C
        WM_SYNCPAINT = &H88
        WM_SYSCHAR = &H106
        WM_SYSCOLORCHANGE = &H15
        WM_SYSCOMMAND = &H112
        WM_SYSDEADCHAR = &H107
        WM_SYSKEYDOWN = &H104
        WM_SYSKEYUP = &H105
        WM_TCARD = &H52
        WM_TIMECHANGE = &H1E
        WM_TIMER = &H113
        WM_UNDO = &H304
        WM_UNINITMENUPOPUP = &H125
        WM_USER = &H400
        WM_USERCHANGED = &H54
        WM_VKEYTOITEM = &H2E
        WM_VSCROLL = &H115
        WM_VSCROLLCLIPBOARD = &H30A
        WM_WINDOWPOSCHANGED = &H47
        WM_WINDOWPOSCHANGING = &H46
        WM_WININICHANGE = &H1A
        WM_XBUTTONDBLCLK = &H20D
        WM_XBUTTONDOWN = &H20B
        WM_XBUTTONUP = &H20C
    End Enum
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim HWND = FindWindow(vbNullString, "Выполнить") 'Хэндл окна.
        If HWND <> 0 Then
            PostMessage(HWND, WndMsg.WM_KEYDOWN, Keys.Escape, 0) 'Нажать кнопку ESC
            Thread.Sleep(5000) 'Пауза 5 сек.
            PostMessage(HWND, WndMsg.WM_KEYUP, Keys.Escape, 0) 'Отпустить кнопку ESC
        End If
    End Sub
 
End Class

Private Declare Sub SetCursorPos Lib "user32.dll" (ByVal x As Integer, ByVal y As Integer)
SetCursorPos(x, y)

Const WM_LBUTTONDOWN As Integer = &H201
Const WM_LBUTTONUP As Integer = &H202 
 
SendMessage(HWND, WM_LBUTTONDOWN, 0, 600 + (200 * &H10000))
SendMessage(HWND, WM_LBUTTONUP, 0, 600 + (200 * &H10000))