Can I just close the top to shut down the system completely, or is it better to log off in Windows? When I just shut the top, it feels hot when I take it out of the case, so I'm assuming that's not really shutting it down.The Acer website tech response "virtual " info said something about a power icon to click on in the lower right taskbar, but I see no such icon, just the battery indicator. There is the power switch on the keyboard, of course. Is it OK to just shut the top, or should I do it differently? If it goes into Windows hibernation, will it shut it down for power/cooling purposes? It sometimes hangs on the Windows shutdown, and then I just hold down the power button, but is there a better way?