I'm sure we've all had the experience of being called from India; someone who says they are Windows technical support and your computer has a problem. yada yada. If they aren't hung up on, the ones that I'm familiar with end up asking for a credit card charge of around $180 to help you fix all your problems.
Recently I've had reports of people who received a phone call ... probably much like the above ... and "the next thing I knew they were in my computer". "All I had to do was open my browser to its home page".
So, the mechanism for access is either wrong, obscure or scary.
I would expect that they would ask for some particular actions by the operator/user.
I read that going to particular web pages is one mechanism.
Does anyone have actual experience along the lines of "taking over the computer" as if a remote support session with no real "help" from the owner?
I seriously doubt it but when one seriously doubts, that's a good time to ask. :-)