Remote desktop for macOS: 9-digit ID, 6-digit code
Leave the computer at home. Type a nine-digit ID and the screen is there: on a laptop, on an iPhone, or in the browser of a machine that isn't yours. No account, no VPN, nothing to change on the router.

Most remote software pushes the picture through the vendor's cloud. Here the two machines shake hands and send straight to each other; the meeting point only moves bytes and has no key to open them.
The computer schedules its own wake-ups in hardware, checks every few minutes for a caller, and sleeps again eight seconds later if there isn't one.
The ID finds the machine, the code lets you in. No account to create.
On a machine where you cannot install anything, the session still opens.
Command, Option and the shortcuts you already have in your fingers.
The macOS build updates itself the way Mac apps are expected to.

