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Protected Memory

Hi, I haven't posted here before.  So, nice to meet you all and hope this isn't off topic :)

I was wondering if it is possible at all for one userland application to access another application's memory space.  By "userland" I mean non-kernel code... that's the correct term right?  I had a program under OS 9 that could be used to do this (mostly to cheat at games :)

I understand that under Darwin memory is "protected" and one application can only use its memory space and/or shared memory (which I have no idea about at all).

Anyway, my secondary question is: can one application access another's memory?

I am dissapointed that I have to ask this question, but I could not find any sort of in-depth documentation of Darwin's memory management on the Apple site or after doing a bit of Googling...

So, my main question is where can I find that sort of information?

--
-william 
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