///see Remark in KEYBDINPUT, SendInput, WM_KEYDOWN, and WM_KEYUP

Have a look at SendInput for an example of where these constants are used.

   // For use with the INPUT struct, see SendInput for an example

    ' For use with the INPUT struct, see SendInput for an example

FYI, Microsoft tells us for "Windows NT/2000/XP: This function has been superseded. Use SendInput instead."

Thus I have resigned myself to unmanaged code for now. I will post the SendInput version shortly as mouse_event has been deprecated by Bill in favor of SendInput.

The SendInput function synthesizes keystrokes, mouse motions, and button clicks to the currently active window

   internal static extern uint SendInput (uint nInputs,

Friend Shared Function SendInput(<[In]()> ByVal nInput As UInt32,

Private Declare Function SendInput Lib "user32.dll" (ByVal cInputs As Integer, ByRef pInputs As INPUT, ByVal cbSize As Integer) As Integer

   Api.user32.SendInput((uint)pInputs.Length, pInputs, StructLib.INPUT.Size);

   Start-Sleep 2 ; [Testing.Windows3]::SendInput($_inputArray.count, $_inputArray, [Runtime.InteropServices.marshal]::SizeOf($_inputArray[0]))

        ///Windows 2000/XP: Used to pass Unicode characters as if they were keystrokes. The VK_PACKET key is the low word of a 32-bit Virtual Key value used for non-keyboard input methods. For more information, see Remark in KEYBDINPUT, SendInput, WM_KEYDOWN, and WM_KEYUP

static extern uint SendInput(uint cInputs, /* [MarshalAs(UnmanagedType.LPArray)] */ KEYBOARDINPUT[] inputs, int cbSize);

Declare Function SendInput Lib "coredll.dll" (TODO) As TODO

        public static extern uint SendInput(uint cInputs, /* [MarshalAs(UnmanagedType.LPArray)] */ KEYBOARDINPUT[] inputs, int cbSize);

        retVal = cTabControl.SendInput(2, inputs, 0x001C);

        throw new Exception(string.Format("SendInput() returned {0}.", error));

        retVal = cTabControl.SendInput(4, inputs, 0x001C);

        throw new Exception(string.Format("SendInput() returned {0}.", error));

        retVal = cTabControl.SendInput(4, inputs, 0x001C);

        throw new Exception(string.Format("SendInput() returned {0}.", error));

        retVal = cTabControl.SendInput(6, inputs, 0x001C);

        throw new Exception(string.Format("SendInput() returned {0}.", error));