VNC server that locks/blanks out the screen?

Is there a VNC server that blanks out the local screen whenever the
machine is being used remotely?

There only seems to be three VNC servers; Vine Server, the Back to my
Mac jobby built-in to OSX Leopard, and the abandoned CocoaVNC. Nne of
them seem capable of doing this, unless I am missing something.

        -z-
 
-- 
"Ignorance more frequently begets confidence than does knowledge."
                                     - Charles Darwin