OS X Mountain Lion: Change how scroll bars work

Change Scroll bars

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Use General Preferences to customize scroll bars in windows.

  1. Choose Apple menu > System Preferences, and then click General.
  2. Set the scrolling options. For more information about the scrolling options, click the Help button.

Some apps let you scroll through a document in other ways, such as by dragging in the document, using arrow keys, or pressing the Space bar.