一個按鍵事件的產生: http://maddrone.blogspot.com/2006/08/blog-post_31.html
Keyboard and Pointer Events: http://tronche.com/gui/x/xlib/events/keyboard-pointer/keyboard-pointer.html
XFakeKey: http://antontw.blogspot.com/2007/04/programming-xfakekey.html