Comment 1 for bug 484476

In fact, it depends on the way you launched you vnc server.
When I launch a new vnc server (command "vncserver"), it starts a new X server with a virtual screen. This is really secure, because there are no physical screen attached to it, so a bad guy in front of the workstation can't access it.

Which tool/command are you using to start your vnc server ?

I think a real X server shared with VNC should not be locked when a VNC client is connecting :a lot of people (hum... me) are using this behavior to remotely help and train my end-users.