C# Signature:

[DllImport("user32.dll")]
static extern uint MapVirtualKeyEx(uint uCode, uint uMapType, IntPtr dwhkl);

or

[DllImport("user32.dll")]
static extern uint MapVirtualKeyEx(uint uCode, MapVirtualKeyMapTypes uMapType, IntPtr dwhkl);

User-Defined Types:

const uint MAPVK_VK_TO_VSC = 0x00;
const uint MAPVK_VSC_TO_VK = 0x01;
const uint MAPVK_VK_TO_CHAR = 0x02;
const uint MAPVK_VSC_TO_VK_EX = 0x03;
const uint MAPVK_VK_TO_VSC_EX = 0x04;

or

/// <summary>
/// The set of valid MapTypes used in MapVirtualKey
/// </summary>
public enum MapVirtualKeyMapTypes : uint
{
     /// <summary>
     /// uCode is a virtual-key code and is translated into a scan code.
     /// If it is a virtual-key code that does not distinguish between left- and
     /// right-hand keys, the left-hand scan code is returned.
     /// If there is no translation, the function returns 0.
     /// </summary>
     MAPVK_VK_TO_VSC = 0x00,

     /// <summary>
     /// uCode is a scan code and is translated into a virtual-key code that
     /// does not distinguish between left- and right-hand keys. If there is no
     /// translation, the function returns 0.
     /// </summary>
     MAPVK_VSC_TO_VK = 0x01,

     /// <summary>
     /// uCode is a virtual-key code and is translated into an unshifted
     /// character value in the low-order word of the return value. Dead keys (diacritics)
     /// are indicated by setting the top bit of the return value. If there is no
     /// translation, the function returns 0.
     /// </summary>
     MAPVK_VK_TO_CHAR = 0x02,

     /// <summary>
     /// Windows NT/2000/XP: uCode is a scan code and is translated into a
     /// virtual-key code that distinguishes between left- and right-hand keys. If
     /// there is no translation, the function returns 0.
     /// </summary>
     MAPVK_VSC_TO_VK_EX = 0x03,

     /// <summary>
     /// Not currently documented
     /// </summary>
     MAPVK_VK_TO_VSC_EX = 0x04
}

Notes:

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