Pair two Macs

Both Macs show the same six-digit code, and you allow it on the sharing Mac.

Pairing connects two Macs once. After that, each recognises the other by its certificate, and everything between them is encrypted.

Open Tele on both Macs.
On the Mac you want to open windows from, turn on Share this Mac. It's off until you do.
Both Macs show the same six-digit code. Check that they match.
Allow it on the sharing Mac.

Only allow it if the codes match. A different code means you're not connecting to the Mac you think you are.

If a Mac doesn't appear, see Tele can't see my other Mac.