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Apple’s MacBook Pro memory problem is worse than ever
(www.macworld.com)
This is a most excellent place for technology news and articles.
Macs have an alt key, it's just called option. https://cdn.osxdaily.com/wp-content/uploads/2016/05/option-alt-keys-apple-us-keyboard.jpg
Most key combos are slightly different on mac though. Windows has a lot of ctrl or alt + key combos, Mac largely just has them all done with the command key. But that's obviously down to the developer, they could do whatever they want.