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How duplicating, cloning, and running multiple accounts of the same Mac app actually works — the real mechanisms, explained honestly, not as a sales pitch.

• How to duplicate an app on macOS — and why it doesn't work

  Copying an app in Finder doesn't give you a second account. Here's exactly what macOS keys an app's identity by, and what it actually takes to duplicate one.

• How to run two instances of the same app on Mac

  Four real ways to run a second copy of an app on macOS, compared honestly — what each one actually isolates, and what it costs you.

• Why open -n doesn't give you a second account

  open -n spawns a new process, not a new account. Here's exactly what macOS's -n flag does, the two ways it fails, and what actually decides whether you get a second login.