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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

  Five ways to open a second copy of a Mac app — Terminal, a second user, browser profiles, a VM, a real clone — compared on what each isolates and what it costs.

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

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

• How to give each Chrome profile its own icon in the Mac Dock

  Every Chrome profile shares one Dock icon on a Mac. Three ways to get a profile its own icon, what each one actually gives you, and where each falls short.

• How to use two GitHub accounts in VS Code on Mac

  Commit and push as the right GitHub account per folder, sign VS Code into two accounts at once, and know when you need a fully separate VS Code.