When you come back to your Mac and want to keep working on the same prototype:

1. Open Terminal.
2. Go to your project folder (replace myapp with your folder name):

cd myapp

3. Start Prototo — the Simulator opens:

npx proto start

4. Open a second Terminal tab or window. Go to the same folder and start Claude Code:

cd myapp
claude

Leave the first window running Prototo. Do all your prompting in the second window. Watch the Simulator.

That is the same setup as The two-window model. You are not starting from scratch — just waking it back up.