No download, nothing to install. Your technician can see your screen and guide you. They cannot click or type on your computer from here.
Give this code to your technician. When they connect, the button below lights up. Click it, pick the screen to share, and you are live. Your browser asks you to confirm before anything is shared.
Sharing stops the moment you click Stop, use the browser's stop control, or close this tab. This page never records anything.