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Apple has a memory problem and we're all paying for it
(www.macworld.com)
This is a most excellent place for technology news and articles.
It's called Mac OS and is actually a version of UNIX heavily modified by Apple. Linux is basically a copy of UNIX. Mac OS does not have a registry. Mac OS and Windows couldn't be more different. OSX (the X stands for 10) was the versions of Mac OS that had 10 as the major version number that ended with Catalina.