copy/paste integration
i.e. if I copy some text on the sytem with a VNC client, and then try and paste it on the system I am remoting into, I expect that to work, and vice versa
This used to work with X11 and Vino, but also requires a client that supports the copy/paste extensions to the VNC protocol.
Note that even though Vino/X11 worked for raw text, it also clearly had negotiation issues with more complex data, so not expecting that to work.