FilterKeys (or Filter Keys) is an accessibility feature of Microsoft Windows. It tells the keyboard to ignore brief or repeated keystrokes. This makes typing easier for users with hand tremors.
Microsoft first introduced FilterKeys with Windows 95. The feature is also used on later versions of Windows.
FilterKeys is turned on by holding the right ⇧Shift key for 8 seconds. This feature can also be turned on and off via the Accessibility or Ease of Access icon found either in the Control Panel or from within the Settings app.