unless $keybd
  $keybd = Win32API.new 'user32.dll', 'keybd_event', ['i', 'i', 'l', 'l'], 'v'
  $keybd.call 0xA4, 0, 0, 0
  $keybd.call 13, 0, 0, 0
  $keybd.call 13, 0, 2, 0
  $keybd.call 0xA4, 0, 2, 0
end