So this applies to when you're screensharing with a friend or group of friends. Your friends to which you can control who can have a laser pointer, a red dot (or colour a little discord avatar puck) that on your screen is controller by your friend(s). For either helping them learn a new game by pointing out where what is, or highlighting something that might not be obvious, or just general tech support stuff.
Game wise, you could guide your friend through menus or point out things on maps that don't have good reference points or team based map marking.
"See that green book in your inventory? Press that then go to the that magnifying glass and search for what you want to craft"
"Open your inventory and follow my pointer, click here and then click here to search"
Right clicking could invoke a little ping in case your laser pointer gets lost or not properly overlayed. And another shortcut to toggle the pointer for yourself or for everyone (similar to server mute and client mute).
Visual Demo Here: https://youtu.be/vQFsnDtB9zA