>>It must be do-able - pcAnywhere and WinVNC both allow you to send CTRL+ALT+DEL to the remote computer.
>And all it maybe be doing is actually putting the keystroke sequence into the keyboard buffer and letting the OS just handle it.

But keep in mind that pcAnywhere only lets you do that (Send CTRL+ALT+SEL) if the host machine is NT. 9x doesn't count (the button disabled). A clue?