We use Real VNC at work, so the IT staff can take control whenever they need to work on a station. Sometimes though, they do things right when I'm in the middle of something. Is there a way to drop the connection from the local machine?

That is, I want to be able to press a button(or button combo) so that it either completly drops the connection, or at least makes it so that they can only view the screen, and not control the KB and mouse?

Thanks
Any help is much apprectiated.