Where would you find a 7C3457EF-0000-11AA-AA11-00306543ECAC? How UUIDs have taken over to identify so much, and how to generate your own.
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You click on a link to get Apple software from the App Store, but it doesn’t work. Why not? What can you do to work around this?
They’re almost everywhere now: UUIDs and GUIDs identify disk volumes, printers, even the processes running on your Mac. Here’s an explanation.
The Eclectic Light Company 