For programming questions about Rosetta, the Mac OS X dynamic binary translator allowing PowerPC applications to run on Intel-based Macs. Supported under OS X 10.4 (Tiger); unsupported as of OS X 10.7 (Lion).
Rosetta is not an app that you need to open. Rosetta works automatically in the background whenever you use an app built only for Mac computers with an Intel processor. It translates the app for use with Apple silicon.
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