This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
I think that's a question of where the focus is. Generally, the focus will not be on the applet when the page is loaded, so for the applet to see any keystrokes, it needs to get the focus first (which is done by clicking on it).