Quick Assist for Mac?
WIndows 10 to WIndows 10 now have a great utility that does not require any installation, but gives a secure code to communicate between two machines over the internet, called Quick Assist.
Macs can use Screen Sharing in much the same manner with each other, but you need to enable screen sharing on the client Mac that is being remoted into.
Is there any software that works without the client Mac having to dig into System Preferences to make allowances for remote access, that allows just code based access?