By clicking an icon and then choosing File→Get Info, you open an important window like the one shown in Figure 2-12. It's a collapsible, multipanel screen that provides a wealth of information about a highlighted icon. For example:
For a document icon, you see when it was created and modified, and what programs it "belongs" to.
For an alias, you learn the location of the actual icon it refers to.
For a program, you see whet her or not it's been updated to run on Intel-based Macs. If so, the Get Info window says Kind: Universal. If not, it says Kind: PowerPC, and will probably run slower than you'd like because it must be translated by Rosetta (Notes on the Keyboard).
For a disk icon, you get statistics about its capacity and how much of it is full.