Just the other day - I forget the particulars, I was helping someone, told them to open up team viewer. OK, it's open, I logged in, start poking around. I'm trying to click on something in particular when the mouse is unresponsive. here is what ensued:
Me: Do you have the mouse?
Her: Yes, I do.
Me: Do you want to do this, or do you want me to do it?
Her: Oh, yes, I'm sorry, you do it.
Sometimes a gentle reminder is enough, Sometimes it just isn't.