OS 9 permissions and other stuff

in Genius Bar edited January 2014
what are the OS 9 permissions for? i was under the assumption that permissions were for OS X only. then i see "Fix OS 9 Permissions" in Disk Utility, so, i'm wondering what that is for?! Also, when it is fixing permissions, what do the wrx-r, etc..., mean? that has always been something i've been curious about. thanks in advance.
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