Every document, program, folder, and disk on your Mac is represented by an icon: a colorful little picture that you can move, copy, or double-click to open. In Mac OS X, icons look more like photos than cartoons, and you can scale them to practically any size.
A Mac OS X icon's name can have up to 255 letters and spaces. If you're accustomed to the 31-character limit of Mac OS 9, that's quite a luxurious ceiling.
If you're used to Windows, you may be delighted to discover that in Mac OS X, you can name your files using letters, numbers, punctuation—in fact, any symbol except for the colon (:), which the Mac uses behind the scenes for its own folder-hierarchy designation purposes. And you can't use a period to begin a file's name.
To rename a file, click its name or icon (to highlight it) and then press Return or Enter. (Or, if you have time to kill, click once on the name, wait a moment, and then click a second time.)
In any case, a rectangle now appears around the name (see Figure 2-2). At this point, the existing name is highlighted; just begin typing to replace it. If you type a very long name, the rectangle grows vertically to accommodate new lines of text.
If you simply want to add letters to the beginning or end of the file's existing name, press the left or right arrow key immediately after pressing Return or Enter. The insertion point jumps to the corresponding end of the file name.
Figure 2-2. Click an icon's name (top left) to produce the renaming rectangle (top ...