About the "Ignoring trackpad when mouse is present" option on computers with a Multi-Touch trackpad
Summary
Are you trying to locate the "Ignore trackpad when mouse is present" trackpad option on the Trackpad tab in Keyboard & Mouse System Preferences, or—if using Mac OS X v10.5.6 or later—the Trackpad System Preferences on your MacBook, MacBook Pro, or MacBook Air computer with a Multi-Touch trackpad?
Products Affected
MacBook Air (Mid 2009), MacBook Pro (17-inch, Mid 2009), MacBook Pro (13-inch, Mid 2009), MacBook Pro (15-inch, Mid 2009), MacBook Pro (15-inch, 2.53GHz, Mid 2009), MacBook Air (Original), MacBook Pro (15-inch Early 2008), MacBook Pro (17-inch, Early 2009), MacBook (13-inch, Aluminum, Late 2008), MacBook Air (Late 2008), MacBook Pro (15-inch, Late 2008)
To allow full use of gestures on the Multi-Touch trackpad even when a mouse is connected, the "Ignore trackpad when mouse is present" trackpad option no longer appears in System Preferences with Mac OS X v10.5.6, Mac OS X v10.5.7, or Mac OS X v10.5.8.
On MacBook, MacBook Pro, and MacBook Air computers with Multi-Touch trackpads running Mac OS X v10.6 Snow Leopard, the option to enable or disable "Ignore trackpad when mouse is present" is in the Mouse & Trackpad tab in the Universal Access System Preferences pane.
Additional Information
To learn keyboard and trackpad tips and shortcuts for MacBook, MacBook Pro, and MacBook Air computers with Multi-Touch trackpads, see MacBook Air and MacBook Pro (Early 2008): Useful keyboard and trackpad tips and shortcuts.