Not sure if its really exploitable but at my library they use flash and if they haven't logged you onto a computer you can still access the internet by left clicking then using the right-click button on the keyboard (cant remember the technical name), then goto About flash (or whatever) then it opens the internet. Also if someone has logged on before you then you go to the top left corner and right click, then click back and it goes to the T&C (which you see when they log you on) and you can then access the C:/ Drive via Your Storage (show the toolbar -> up -> C:/). I know this is mostly used in england not sure about other countries but hey a exploit is an exploit .