Our latest FAQ comes in response to readers asking how to install an OS X update from the Mac App Store. For many of you, acquiring system updates from the Mac App Store has a familiar feel, but it is a little different than using the old Software Update service in the Apple menu.
Courtesy of Apple
The FAQ also covers how to use the Mac App Store to download full updates, which are essentially equivalent to the combo updates that Apple used to host on its web site.
If you have any questions related to updating your Mac's system software via the Mac App Store, take a look at: