param([int]$dx = 1)

Add-Type -TypeDefinition @"
using System;
using System.Runtime.InteropServices;

public class MouseInput {
    [StructLayout(LayoutKind.Sequential)]
    public struct MOUSEINPUT {
        public int dx;
        public int dy;
        public uint mouseData;
        public uint dwFlags;
        public uint time;
        public IntPtr dwExtraInfo;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct INPUT {
        public uint type;
        public MOUSEINPUT mi;
    }

    [DllImport("user32.dll")]
    public static extern uint SendInput(uint nInputs, INPUT[] pInputs, int cbSize);

    public const uint INPUT_MOUSE = 0;
    public const uint MOUSEEVENTF_MOVE = 0x0001;
}
"@

$input = New-Object MouseInput+INPUT
$input.type = [MouseInput]::INPUT_MOUSE
$input.mi.dx = $dx
$input.mi.dy = 0
$input.mi.dwFlags = [MouseInput]::MOUSEEVENTF_MOVE
$input.mi.time = 0
$input.mi.dwExtraInfo = [IntPtr]::Zero

$size = [Runtime.InteropServices.Marshal]::SizeOf($input)
[MouseInput]::SendInput(1, @($input), $size) | Out-Null