title: Hook key & key combinations from keyboard with Qt 4.6
body: <p>Let's say I have a window-less application which has only an icon on the Taskbar (Windows, Mac OS X &amp; Linux). I want it to capture some key &amp; key combinations, let's say Right Control + Right Shift. Upon keying in correct, combination, it will do something, say take screenshot. I can do window-less app, icon on the Taskbar and screen capture but I don't know how to monitor keyboard globally for key combinations. Please kindly advise. Any help or hint is greatly appreciated! Thanks in advance!</p>