Just a note: I am very positive that I have connected to a server (with WinVNC, if I recall correctly) that I could send a CTRL-ALT-DEL to, to lock the workstation, and it worked. This would seem to indicate that it is possible to emulate it, as the workstation which is also running Win VNC must give the command to lock the station (unless, of course, there is another way to do this, and it is using that method, instead). Any ideas?