In some situations, the Applications folder may be locked or have incorrect permissions after installing Mac OS X 10.1.
It lets you reset or change the permissions of your files and folders.
Fix your iPhone stuck on Apple logo, black screen, frozen screen, etc.
Necessary if you use OS X Lion clients
Can prevent you from being able to use Disk Utility's "Repair Permissions" tab
Upload files by copying them to a folder on your computer.
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