Answers:
1. Directories are generally referred to as Volumes/Hard Drive/Users/Unsernme/Folder/File.file although a simple way to keep on top of physical directories is to use Finder in Column View (command+3 from a Finder window) as there is no way I know of to make the computer display a directory. As for digging into an App folder, right-click the App and select 'Show Package Contents'.
show package contents...thats it.
Austin