Free OS X Mountain Lion Pocket Guide by Chris Seibold

disk
     space from the Where pop-up menu. Click Save and Mountain Lion makes
     an image (a special type of copy) of the DVD.
    Once the copying operation is complete, you’ll have a perfect
     copy of the DVD or CD on your drive. To burn that copy onto a blank
     CD or DVD, select the disk image from the list on the left side of
     Disk Utility (if it’s not there, drag the disk image from the Finder
     into the list), and then click the Burn button and insert a blank
     disk when prompted. (Alas, this approach won’t work for
     copy-protected software or movies.)
    The Dock
    The Dock is a key aspect of OS X. It contains shortcuts to
     frequently used applications, folders, and documents, and shows you
     which applications are running by placing a blue dot under each one. (A
     lot of people detest the blue dots; fortunately, you can turn them off:
     just head to → System
     Preferences → Dock and then uncheck the
     box next to “Show indicator lights for open applications.”) Figure 3-16 shows a typical Dock.
    Figure 3-16. A typical Dock
    You can use the Dock to switch among active applications;
     just click the Dock icon of the one you want to switch to, and that
     becomes the frontmost application. When an application is starting up,
     its Dock icon bounces so you can tell that it’s loading. If an
     already-running application’s icon begins bouncing, that’s the Dock’s
     way of telling you the application wants your attention.
    The Finder is on the far left side of the Dock and is always
     running. To the right of that, you’ll see application icons, a
     dotted-line divider, the Applications stack, the Downloads folder, any
     minimized windows, and the Trash.
    Note
    If you upgraded from an older version of OS X, you’ll likely see
     a Documents stack in your Dock as well. You may also find that what
     appears as a stack and what appears as a folder differ from what’s
     listed here. Don’t be alarmed: these differences won’t affect the way
     your files are stored.
    Since the Dock is conveniently located, it’s a natural way of
     opening your most-used applications and documents. The obvious question
     is how do you add items to the Dock? The process is simple: just locate
     the application or document you want to add and then drag it onto the
     Dock. Keep in mind, though, that you can put applications only on the
     left side of the Dock’s divider and you can put documents only on the
     right side of the divider. (Even if you haven’t placed an application or
     a document in the Dock, it will appear there as long as it’s running or
     open.) Adding items to the Dock doesn’t move or change the original
     item, and removing items from the Dock doesn’t delete them from your
     Mac.
    To arrange items in the Dock, simply drag them into the order you
     want. (Dragging a running application that’s not already in the Dock
     permanently will add it.)
    Tip
    If you want to open a particular document in a specific
     application, drag the file onto that application’s icon in the Finder
     or Dock, and that application will generally try to open the file.
     However, some applications respond differently: dragging something
     onto the Mail icon, for example, attaches it to a new message.
    Once your Dock is fully loaded with applications and documents, it
     can get a little overwhelming. If you forget what that minimized window
     is for or what application will start if you click a certain icon, the
     Dock can help you out. Simply put your cursor over the Dock item in
     question and a text bubble pops up with info about that item, as shown
     in Figure 3-17 .
    Figure 3-17. Oh, so that icon represents the App Store...
    Removing items from the Dock is easy: drag the unwanted
     item off of the Dock or onto the Trash icon, or right-click or
     Control-click the item in question and, in the pop-up menu that appears,
     select “Remove from Dock.” (Remember, this removes the item only from
     the Dock—the file