You have Claude Code open in two terminals on the same project. What do the two sessions share of their conversations?

The principle — independence is a property of the session, not a consequence of only one being open.

Why the key is correct — a session is defined as a conversation tied to your current directory, with its own independent context window. Two sessions therefore hold two conversations, and neither can see what the other has discussed.

Why the others are wrong — one shared thread across two terminals would contradict the independent window. Sharing a project does not share a conversation. And the choice claiming only one session can be open at a time reaches the right conclusion through a false premise, which is the reason to read the reasoning and not just the verdict.

Remember this — parallel sessions do not talk to each other; if knowledge must cross, write it down.

Sources — Anthropic's Claude Code glossary.