How to use Global hook meanwhile suppress App hook?

Question

I got stuck the whole morning. I was trying to listen to mouse & keyboard event meanwhile excluding any event happening to the application. But I cannot get it work. Any ideas or code snippets?

My idea is like the following.

private IKeyboardMouseEvents? m_Events;
...
SubscribeGlobal();
// try to unsubscribe mouse&keyboard event in app?

I am expecting the mouse & keyboard event within the app is ignored.