More questions! In Finder, I see Macintosh HD in the sidebar. That is my internal hard-drive. To the right I see.. - Applications - Library - System - Users My understanding is that Macintosh HD > Library represents sshaared library files for all users, right? So what does Macintosh HD > System represent? And what does Macintosh HD > System > Library represent? As far as I know, Macintosh HD > Users > Meg P > Library represents all of the library files associated with my username (e.g. customizations of the desktop or Finder), right? All very confusing!