a security mechanism that separates running programs from each other so that untested, or untrusted programs won't inject malicious or bad code.

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3
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TextEdit shows dialogs about not having permission to open any files

About once per day, TextEdit starts showing dialogs like this when I try to open any file: The document “test.txt” could not be opened. You don’t have permission. To view or change ...
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1answer
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Automatically Save Attachments in Mail.app in 10.8 Mountain Lion

I am trying to automatically save all email sent to one address (let's call it test@example.com) to this folder /Users/luomat/Dropbox/Incoming/e2w/ (where /Users/luomat = $HOME). Here is the rule ...