the difference in pin and quicklaunch is that when pinning, it doesn't take up any extra space
firefox, steam, itunes, and paint are open, the only difference is that there is a square around the one's that are open, if I right click, I can open the program with recently opened documents, for instance, I can right click construct, and open it with the last 5 caps
also, by hovering the mouse over an open item on the bar, you can preview the window, to see what's going on, like how an install is going, etc.
if that's too small,move your mouse over the preview, all other windows become transparent temporarily, and you can see the full window, click at this point, and this is the new active window.
the bottom right little rectangle, closes all windows and shows desktop,
click it again to restore the same windows