Mountain Lion's "Hidden" fix it system?

Want to upgrade from Snow Leopard to Mountain Lion.

In the past, I have used a utility called Applejack that runs in single user mode direct from the app installed on the hard drive that checks my system for problems and automatically "fixes" any problems it finds. It has been a life saver over anything that Apple's Disk Utility has ever done. However, when checking developer's website (sourceforge.net) the discussion there refers to the "hidden" utility in Mountain Lion as doing pretty much the same thing.

I have checked Apple's info on Mountain Lion and find nothing about this "new?" utility. Can anyone give me some info on this OS addition: how it works, what it does, etc.

Thanks.

They're referring to the recovery mode/partition.

Essentially, AppleJack offers you an easy way to run Disk Utility (the command line equivalent) without having to have a system disc at hand. It had a few other nice options, like the ability to purge caches and run cron scripts, but those can easily be done with the system running - and not having done them will never prevent the Mac from booting.

The Lion and Mountain Lion Recovery partition allows you to run Disk Utility without booting from your main OS X partition, and without the need for a disc, rendering AppleJack mostly redundant.