Your computers
Every computer signed in to your Borderless account, wherever you are. Take one off here and the others stop trusting its key within a minute.
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Sign in
Use the same Google account you signed in with under Settings → Account in the app.
Two computers on one network can pair with a click and an Allow, and nothing about that pairing ever leaves them. An account is what lets computers that never meet on a network find each other: each publishes its public key and trusts the keys it finds beside its own. This page is that list, from a browser.
Only your computers' public keys, your screen layout and your synced settings are stored. Your input, your clipboard and your private keys never touch the account.
No computers on this account yet
Open Borderless on a computer, go to Settings → Account and sign in with this same Google account. It appears here within half a minute.
Signing out here only ends this browser session — your computers stay on the account. Signing out in the app is what takes that computer off it.