Application should give consistent response to pen flicks.
As soon as the user assign a command in control panel, application must respond to it in consistent manner. Windows Vista will display the visual feedback regarding the assigned command when user performs any pen flicks. It does not depends on how application is responding to the current pen flick. Sometime application may respond to some other pen flick then the requested pen flick. This means that application do have ability to react to the flicks but in some other way. But it does not mean that application is NOT RESPONDING.
In The Absence Of Light