We have 1000s of pcs where we do software support and we sometimes deploy a short cut for the customer to connect to us, which they click by mistake to open a session or they open up a session without contacting us before hand. We want the ability to right click or click an X on the session to close it without having to open it up and close or disconnect the session.
They are dentists and most times they are unaware they have started a session with us, so when we connect we interrupt them working. If we don't do that the session sits in the queue unopened for most of the day.
We don't use session keys, it is too cumbersome for the client.