Termdeck does not move code or chats between machines. Each chat runs on the machine it started on, and its transcript stays on that machine's disk. It does not keep a sleeping machine awake either: an offline machine's chats wait until it comes back. If you want several Claude Code sessions side by side on a single machine, that is a different job, covered in managing multiple Claude Code sessions.
1. Add the first machine
In the dashboard, open Settings, then Machines and accounts, and choose Add machine. Give it a short name such as laptop or build-vm. That name appears in the sidebar and in every URL for that machine.