Mac OS X 
About QuickTime 7.6.7
QuickTime 7.6.7 improves security and is recommended for all QuickTime 7 users on Windows.
Magic Trackpad: How to find the serial number
Learn how to find the serial number of your Magic Trackpad.
QuickTime Pro: About the "Conform aperture to" setting
Learn about the “Conform aperture to” setting in QuickTime Pro.
Adding additional media format support to QuickTime
Use codec components to extend QuickTime to import or play a variety of additional media formats (such as .wmv, .divx, .mpeg, .mxf).
AirPort: NAT port mapping to L2TP VPN servers at private addresses via AirPort Utility does not work
Learn what to do if NAT port mapping to L2TP VPN servers at private addresses via AirPort Utility does not work.
Mac Bluetooth headset FAQ
Get the answers to frequently asked questions about using Bluetooth headsets with a Mac.
Boot Camp: Multi-Touch trackpad gestures
Learn how to use your MacBook or MacBook Pro trackpad in Windows for secondary clicking, dragging, scrolling, and more.
Apple Portables: Troubleshooting MagSafe adapters
Learn how to troubleshoot one or more of the following MagSafe adapter symptoms.
MacBook (13-inch): Shuts down intermittently
If your MacBook (13-inch) shuts down randomly during use, a downloadable firmware update is now available that resolves this issue.
MacBook Pro (Retina, Late 2013 and later): Using 192 kHz sample rate digital audio
Learn how to use 192 kHz sample rate optical digital audio with your MacBook Pro (Retina, Late 2013 and later).
