DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.
Remote Control conflict notice explains the cross-machine limit
You'll notice
Useful2Signal2
Remote Control
The Remote Control conflict notice now explains that sessions on other machines are out of reach.
What's wrong with this entry?
Anonymous. No account, no email.
What
The notice saying another Claude Code on this machine already holds Remote Control now adds that this terminal cannot see your sessions on other machines and they cannot reach it.
Details
the extra clause appears only when cross-session messaging is enabled for the session
Evidence
so this terminal can't see your sessions on other machines and they can't reach it
Strings lifted out of the shipped bundle, so the claim above can be checked against them.