You'll be asked for the password before it shows or controls anything.
Or enter a pairing code, if you have one.
This computer asks for a password before it'll show anything or accept any input.
Resizes the active window on the computer to a phone-shaped size, so sites/apps reflow into their mobile layout. Off by default — nothing changes until you tap one of these.
Stuck on a Windows security prompt (UAC, Windows Hello, a passkey request)? It can't be clicked remotely at all — but it's normally owned by whichever app asked for it, so closing every open app usually dismisses the prompt along with it.
Not sign-out, not shutdown — the computer stays on and signed in. Unsaved work in other apps will be lost.