Send Ctrl+Alt+Del over VNC with Windows Vista and UAC off?
Doesn't VNC have a feature to send CAD? With RealVNC you can click the VNC-window's icon (at the top left corner) and click "Send Ctrl-Alt-Del". Maybe there's something similar? Otherwise you can of course use RealVNC's client.
After much searching, I gave up and set group policy on the machines to not require Ctrl+Alt+Del.
The latest release of UltraVNC and VNCScan have resolved this issue. There's a pretty thorough post of it at http://vncscan.com/blog/2010/09/ultravnc-and-windows-7-ctrlaltdel/
Set your UAC to the second-lowest level. This will allow you to send Ctrl+Alt+Del to the remote computers through VNC and other remote software.