Re: Window sharing?
Assuming this is a genuine question from someone who hasn't come across this style of work.
A shared window restricts remote access to an application window rather than the whole screen, so your penis-pill notifications don't popup in the corner of your important meeting, and people don't ask you about your desktop background.
Shared content is a read-write area on your machine where you can give control to type or paste content, draw or highlight. I've used it when chairing round-tables of experts- a picture with notations saves a thousand words, and hours doing typed up minutes.