January 12, 2010
How To: Enable “software Secure Attention Sequence”
Windows Vista introduced a new group policy setting which controls whether or not software can simulate a Secure Attention Sequence (SAS). An example of such SAS is the CTRL-ALT-DEL combination. This policy needs to be enabled in order for remote control software like (VNC) to send CTRL-ALT-DEL to the remote machine running Windows Vista/Windows 7.